Yep, that's exactly what I mentioned in my previous post, i.e that there might be an issue with the viewer dimensions when it's loaded inside a hidden tab.
But looks like you have moved the tab to be visible upfront so it all works fine now as expected as far as I can see in your link.
PS: more details on the issue with loading our 3D product viewer on a hidden tab (or any other hidden element) and available solutions are discussed in this post on our forum:
https://www.360-product-views.com/forum/viewtopic.php?f=8&t=507