With the latest Jevelin version 4.2.3 we are seeing the product image gallery displaying one image after the other instead of the slider like before. Here is a screenshot:
I hope you are well today and thank you for your question.
I can see the issue on your shared site.
This can be child theme issue used on your site so to confirm it just temporary use the Jevelin theme on your site. If everything works fine then it’s your site child theme issue.
Also, this can be due to plugin conflict on your site so please try temporary deactivating all plugins except Unyson plugin and WpBakery page builder plugins and see whether everything works fine and then enable the plugins one by one to see which plugin is conflicting if any.