Hello @steve.li.vt,
Thank you for providing us with the video of your issue. We have tested your site on a browser width of 1639px and it is working perfectly for us with no issues. We have captured a detailed video for you, which you can view here: https://www.veed.io/view/b223a911-1689-4e73-bdfb-458447486e8b?sharingWidget=true&panel=share
It appears that this is a cache issue on your end, so please try clearing the cache and checking again.
Additionally, we have the “Disable Old Browser Support” option in our theme under XStore >> Theme Options >> Speed Optimization, which you can try using.
Best Regards,
8Theme’s Team