Hello @Tincho,
We have recently conducted a review of your site and it appears to be functioning properly. When a product is added to the cart, the sidebar off-canvas automatically pops up and works correctly. We have also recorded a video for you to view at the following link: https://www.veed.io/view/7f6624c8-b17a-4abb-bcdd-69dbfe25f320?sharingWidget=true&panel=share.
We suggest that you clear the cache of your site and browser and check back again.
Best Regards,
8Theme’s Team