Hello,
We found that problem is related to this option http://prntscr.com/rsuuox Once we disable it everything works fine. Our developers are working on your site to find out which part of your product conflicts with that option and causes the error with the product sliders.
By the way, during checking your products we found that you use png images with big resolution and every image takes 3-6Mb – it’s a huge size. Your site will be very slow! Don’t use png format for such images, convert them to jpg and use optimization services in addition, for example, https://tinypng.com/, it will allow you to reduce image size from 5Mb to 200kb, compare https://gyazo.com/fd8d23022e967c1afb44e73e18d73126
You can do this until we fix the problem with the product sliders.
Regards