Flexslider data-autoplay not working properly

Dear Canvas Support Team

I have a problem with the flexslider autoplay speed. It is ignoring every number and plays the slider always with 5000 ms.
On the other hand, the number in data-speed is accepted correctly.

My HTML Code:
<section id="sliderjme" class="boxed-slider">
<div class="container clearfix">
<div class="fslider" data-speed="600" data-autoplay="20000">
<div class="flexslider" id="flexslider333" >
<div class="slider-wrap">|</div>
</div>
</div>
</div>
</section>

How can I get the data-autoplay number to work?

Kind regards
Jeannette

Yo saved my life! It is working, thank you very much.

I never found the slider Settings in the Documentation > Shortcodes > Responsive Slider Section. I looked only at Documentation > Sliders. Maybe a link to the Shortcode Section would help?

Anyway, Thanks a lot for the good and fast support.
Kind Regards
Jeannette