Hello,
You will need to change the ID of the Layers and the data-index of the Slide to a unique one. Consider adding the following code as your Fourth Slide:
<!-- SLIDE -->
<li data-index="rs-25" data-transition="scaledownfrombottom" data-slotamount="default" data-hideafterloop="0" data-hideslideonmobile="off" data-easein="default" data-easeout="default" data-masterspeed="1500" data-rotate="0" data-saveperformance="off" data-title="Slide" data-param1="" data-param2="" data-param3="" data-param4="" data-param5="" data-param6="" data-param7="" data-param8="" data-param9="" data-param10="" data-description="">
<!-- MAIN IMAGE -->
<img src="include/rs-plugin/demos/assets/images/dummy.png" alt="Image" data-lazyload="include/rs-plugin/demos/assets/images/city_bg.jpg" data-bgposition="center center" data-bgfit="cover" data-bgrepeat="no-repeat" data-bgparallax="7" class="rev-slidebg" data-no-retina>
<!-- LAYERS -->
<!-- LAYER NR. 1 -->
<div class="tp-caption tp-shape tp-shapewrapper tp-resizeme rs-parallaxlevel-7"
id="slide-2-25-layer-1"
data-x="['center','center','center','center']" data-hoffset="['171','301','0','0']"
data-y="['top','top','top','top']" data-voffset="['125','105','220','130']"
data-width="['340','600','600','400']"
data-height="['700','330','330','240']"
data-whitespace="nowrap"
data-transform_idle="o:1;"
data-transform_in="y:bottom;s:1500;e:Power4.easeOut;"
data-transform_out="y:-70px;sX:1;sY:1;opacity:0;s:1000;e:Power4.easeInOut;"
data-start="500"
data-basealign="slide"
data-responsive_offset="on"
style="z-index: 5;background-color:rgba(255, 255, 255, 1.00);border-color:rgba(0, 0, 0, 0);"> </div>
<!-- LAYER NR. 2 -->
<div class="tp-caption tp-resizeme rs-parallaxlevel-4"
id="slide-2-25-layer-2"
data-x="['center','center','center','center']" data-hoffset="['146','97','-214','-165']"
data-y="['top','top','top','top']" data-voffset="['144','113','229','138']"
data-width="none"
data-height="none"
data-whitespace="nowrap"
data-transform_idle="o:1;"
data-transform_in="y:bottom;s:1500;e:Power4.easeOut;"
data-transform_out="y:-70px;opacity:0;s:1000;e:Power4.easeInOut;"
data-start="500"
data-basealign="slide"
data-responsive_offset="on"
style="z-index: 6;"><img src="include/rs-plugin/demos/assets/images/dummy.png" alt="Image" data-ww="['250px','250px','250px','180px']" data-hh="['313px','313px','313px','225px']" data-lazyload="include/rs-plugin/demos/assets/images/iphone_big-1.png" data-no-retina> </div>
<!-- LAYER NR. 3 -->
<div class="tp-caption tp-shape tp-shapewrapper tp-resizeme rs-parallaxlevel-4"
id="slide-2-25-layer-6"
data-x="['center','center','center','center']" data-hoffset="['171','122','-189','-147']"
data-y="['top','top','top','top']" data-voffset="['209','178','294','185']"
data-width="['100','100','100','72']"
data-height="['183','183','183','131']"
data-whitespace="nowrap"
data-transform_idle="o:1;"
data-transform_in="y:bottom;s:1600;e:Power4.easeOut;"
data-transform_out="y:-70px;opacity:0;s:1000;e:Power4.easeInOut;"
data-start="500"
data-basealign="slide"
data-responsive_offset="on"
style="z-index: 7;background-color:rgba(138, 0, 255, 1.00);border-color:rgba(0, 0, 0, 0);"> </div>
<!-- LAYER NR. 4 -->
<div class="tp-caption tp-resizeme rs-parallaxlevel-4"
id="slide-2-25-layer-7"
data-x="['center','center','center','center']" data-hoffset="['171','122','-189','-147']"
data-y="['top','top','top','top']" data-voffset="['269','240','361','234']"
data-fontsize="['50','50','40','30']"
data-lineheight="['50','50','40','30']"
data-width="['90','90','90','80']"
data-height="none"
data-whitespace="normal"
data-transform_idle="o:1;"
data-transform_in="y:bottom;s:1600;e:Power4.easeOut;"
data-transform_out="y:-70px;opacity:0;s:1000;e:Power4.easeInOut;"
data-start="500"
data-splitin="none"
data-splitout="none"
data-basealign="slide"
data-responsive_offset="on"
style="z-index: 8; min-width: 90px; max-width: 90px; white-space: normal; font-size: 50px; line-height: 50px; font-weight: 900; color: rgba(255, 255, 255, 1.00);text-align:center;"><i class="icon-cubes"></i> </div>
<!-- LAYER NR. 5 -->
<div class="tp-caption tp-resizeme rs-parallaxlevel-7"
id="slide-2-25-layer-3"
data-x="['center','center','center','center']" data-hoffset="['170','382','68','51']"
data-y="['top','top','top','top']" data-voffset="['529','183','297','158']"
data-fontsize="['20','20','20','15']"
data-lineheight="['20','20','20','15']"
data-width="['240','320','320','260']"
data-height="none"
data-whitespace="normal"
data-transform_idle="o:1;"
data-transform_in="y:bottom;s:1500;e:Power4.easeOut;"
data-transform_out="y:-70px;opacity:0;s:1000;e:Power4.easeInOut;"
data-start="650"
data-splitin="none"
data-splitout="none"
data-basealign="slide"
data-responsive_offset="on"
style="z-index: 9; min-width: 240px; max-width: 240px; white-space: normal; font-size: 20px; line-height: 20px; font-weight: 900; color: rgba(0, 0, 0, 1.00);font-family:Raleway;">ADD-ONS ARE AVAILALBE AND FREE FOR OUR CUSTOMERS </div>
<!-- LAYER NR. 6 -->
<div class="tp-caption tp-resizeme rs-parallaxlevel-7"
id="slide-2-25-layer-4"
data-x="['center','center','center','center']" data-hoffset="['171','382','68','51']"
data-y="['top','top','top','top']" data-voffset="['607','241','356','201']"
data-fontsize="['15','15','14','14']"
data-lineheight="['23','23','20','20']"
data-width="['240','320','320','260']"
data-height="none"
data-whitespace="normal"
data-transform_idle="o:1;"
data-transform_in="y:bottom;s:1500;e:Power4.easeOut;"
data-transform_out="y:-70px;opacity:0;s:1000;e:Power4.easeInOut;"
data-start="650"
data-splitin="none"
data-splitout="none"
data-basealign="slide"
data-responsive_offset="on"
style="z-index: 10; min-width: 240px; max-width: 240px; white-space: normal; font-size: 15px; line-height: 23px; font-weight: 400; color: rgba(153, 153, 153, 1.00);font-family:arial;">Another benefit of buying a Slider Revolution license is our every-growing library of add-ons which add more cool functionality. </div>
<!-- LAYER NR. 7 -->
<a class="tp-caption TechJournal-Button rev-btn tp-resizeme rs-parallaxlevel-7" href="https://goo.gl/WqXjZB" target="_blank" id="slide-2-25-layer-5" data-x="['center','center','center','center']" data-hoffset="['140','313','-2','10']" data-y="['top','top','top','top']" data-voffset="['723','334','441','296']" data-width="none" data-height="none" data-whitespace="nowrap" data-transform_idle="o:1;" data-transform_hover="o:1;rX:0;rY:0;rZ:0;z:0;s:200;e:Power1.easeInOut;" data-style_hover="c:rgba(0, 0, 0, 1.00);bg:rgba(229, 229, 229, 1.00);" data-transform_in="y:bottom;s:1500;e:Power4.easeOut;" data-transform_out="y:-70px;opacity:0;s:1000;e:Power4.easeInOut;" data-start="650" data-splitin="none" data-splitout="none" data-actions='' data-basealign="slide" data-responsive_offset="on" style="z-index: 11; white-space: nowrap;outline:none;box-shadow:none;box-sizing:border-box;-moz-box-sizing:border-box;-webkit-box-sizing:border-box;cursor:pointer;" rel="noopener">HOOK ME UP! </a>
<!-- LAYER NR. 8 -->
<div class="tp-caption tp-shape tp-shapewrapper tp-resizeme rs-parallaxlevel-7"
id="slide-25-layer-1"
data-x="['center','center','center','center']" data-hoffset="['531','146','-155','0']"
data-y="['top','top','top','top']" data-voffset="['125','455','570','380']"
data-width="['340','290','290','400']"
data-height="['340','290','290','220']"
data-whitespace="nowrap"
data-transform_idle="o:1;"
data-transform_in="y:bottom;s:1500;e:Power4.easeOut;"
data-transform_out="y:-70px;opacity:0;s:1000;e:Power4.easeInOut;"
data-start="750"
data-basealign="slide"
data-responsive_offset="on"
style="z-index: 12;background-color:rgba(255, 255, 255, 1.00);border-color:rgba(0, 0, 0, 0);"> </div>
<!-- LAYER NR. 9 -->
<div class="tp-caption tp-resizeme rs-parallaxlevel-7"
id="slide-25-layer-3"
data-x="['center','center','center','center']" data-hoffset="['531','146','-155','0']"
data-y="['top','top','top','top']" data-voffset="['192','482','597','409']"
data-fontsize="['20','20','20','15']"
data-lineheight="['20','20','20','15']"
data-width="['240','230','230','340']"
data-height="none"
data-whitespace="normal"
data-transform_idle="o:1;"
data-transform_in="y:bottom;s:1500;e:Power4.easeOut;"
data-transform_out="y:-70px;opacity:0;s:1000;e:Power4.easeInOut;"
data-start="750"
data-splitin="none"
data-splitout="none"
data-basealign="slide"
data-responsive_offset="on"
style="z-index: 13; min-width: 240px; max-width: 240px; white-space: normal; font-size: 20px; line-height: 20px; font-weight: 900; color: rgba(0, 0, 0, 1.00);font-family:Raleway;">WHAT ARE YOU WAITING FOR? </div>
<!-- LAYER NR. 10 -->
<div class="tp-caption tp-resizeme rs-parallaxlevel-7"
id="slide-25-layer-4"
data-x="['center','center','center','center']" data-hoffset="['530','146','-155','0']"
data-y="['top','top','top','top']" data-voffset="['250','533','656','452']"
data-fontsize="['15','15','14','14']"
data-lineheight="['23','23','20','20']"
data-width="['240','230','230','340']"
data-height="none"
data-whitespace="normal"
data-transform_idle="o:1;"
data-transform_in="y:bottom;s:1500;e:Power4.easeOut;"
data-transform_out="y:-70px;opacity:0;s:1000;e:Power4.easeInOut;"
data-start="750"
data-splitin="none"
data-splitout="none"
data-basealign="slide"
data-responsive_offset="on"
style="z-index: 14; min-width: 240px; max-width: 240px; white-space: normal; font-size: 15px; line-height: 23px; font-weight: 400; color: rgba(153, 153, 153, 1.00);font-family:arial;">More than 1,500,000 Slider Revolution users world-wide love the immense variety and endless possibilities. </div>
<!-- LAYER NR. 11 -->
<a class="tp-caption TechJournal-Button rev-btn tp-resizeme rs-parallaxlevel-7" href="https://goo.gl/WqXjZB" target="_blank" id="slide-25-layer-5" data-x="['center','center','center','center']" data-hoffset="['497','117','-184','-84']" data-y="['top','top','top','top']" data-voffset="['366','662','761','527']" data-width="none" data-height="none" data-whitespace="nowrap" data-transform_idle="o:1;" data-transform_hover="o:1;rX:0;rY:0;rZ:0;z:0;s:200;e:Power1.easeInOut;" data-style_hover="c:rgba(0, 0, 0, 1.00);bg:rgba(229, 229, 229, 1.00);" data-transform_in="y:bottom;s:1500;e:Power4.easeOut;" data-transform_out="y:-70px;opacity:0;s:1000;e:Power4.easeInOut;" data-start="750" data-splitin="none" data-splitout="none" data-actions='' data-basealign="slide" data-responsive_offset="on" style="z-index: 15; white-space: nowrap;outline:none;box-shadow:none;box-sizing:border-box;-moz-box-sizing:border-box;-webkit-box-sizing:border-box;cursor:pointer;" rel="noopener">LEARN MORE </a>
<!-- LAYER NR. 12 -->
<div class="tp-caption tp-resizeme rs-parallaxlevel-7"
id="slide-25-layer-8"
data-x="['center','center','center','center']" data-hoffset="['531','456','155','431']"
data-y="['top','top','top','top']" data-voffset="['485','455','570','398']"
data-width="none"
data-height="none"
data-whitespace="nowrap"
data-visibility="['on','on','on','off']"
data-transform_idle="o:1;"
data-transform_in="y:bottom;s:1500;e:Power4.easeOut;"
data-transform_out="y:-70px;opacity:0;s:1000;e:Power4.easeInOut;"
data-start="1000"
data-basealign="slide"
data-responsive_offset="on"
style="z-index: 16;"><img src="include/rs-plugin/demos/assets/images/dummy.png" alt="Image" data-ww="['340px','290px','290px','290px']" data-hh="['340px','290px','290px','290px']" data-lazyload="include/rs-plugin/demos/assets/images/iwatch_smallimage.jpg" data-no-retina> </div>
</li>
This will definitely work fine. Hope this Helps!
Let us know if we can help you with anything else or if you find any further issues.