Works perfect in preview but glitches on live site

So I’m having trouble with image slider on my site, it should ‘reveal’ the image which is in a purple gradient. Instead on the live site (https://www.leoscircus.co.uk/) it glitches and the two first images appear when it should only be the middle one for example in the screenshot. When i move the carousel it fixes the issue.

What could it be?

Also, it may be handy to note, this only started occurring when i added cookies to the site.



Here is my public share link: [LINK](Webflow - Leo's Circus Site)
(how to access public share link)