Hello,
We have just checked this out on Chrome, Firefox on a Macbook but it appears to be working fine for us. If you would like to disable the Animation, you can simply find the following code in the style.css File:
#header,
#header-wrap,
#logo img {
height: 100px;
-webkit-transition: height .4s ease, opacity .3s ease;
-o-transition: height .4s ease, opacity .3s ease;
transition: height .4s ease, opacity .3s ease;
}
#primary-menu > ul > li > ul,
#primary-menu > ul > li > .mega-menu-content,
#primary-menu > ul > li.mega-menu > .mega-menu-content {
-webkit-transition: top .4s ease;
-o-transition: top .4s ease;
transition: top .4s ease;
}
#top-search,
#top-cart {
-webkit-transition: margin .4s ease, opacity .3s ease;
-o-transition: margin .4s ease, opacity .3s ease;
transition: margin .4s ease, opacity .3s ease;
}
body:not(.top-search-open) #header-wrap #logo,
body:not(.top-search-open) #primary-menu > ul,
body:not(.top-search-open) #primary-menu > .container > ul,
body:not(.top-search-open) #top-cart,
body:not(.top-search-open) #side-panel-trigger,
body:not(.top-search-open) #top-account {
opacity: 1;
-webkit-transition: height .4s ease, margin .4s ease, opacity .2s .2s ease;
-o-transition: height .4s ease, margin .4s ease, opacity .2s .2s ease;
transition: height .4s ease, margin .4s ease, opacity .2s .2s ease;
}
and remove the transition related codes inside it. Additionally, you can also consider adding the .static-sticky Class the #header Tag which keeps the Header Static on Sticky.
This will definitely work fine. Let us know if we can help you with anything else or if you find any further issues.