Slide show times in firefox

Hi

So my site has 4 slide shows in the top 800px of the site.
They are all set to slide after 4 seconds together.
This works fine on Chrome
But on firefox they seem to play at totally random times and never together. Its always one after another. Is there something stopping them running together.

Any feedback would be great.
That site is https://thinkcloudvendors.com/

Cheers

https://www.ads-software.com/plugins/slideshow-jquery-image-gallery/