Board Thread:Support Requests - Getting Technical/@comment-36357687-20180731204612/@comment-36409869-20180801015230

If you still haven't found what's causing your problem maybe you can contact staff, maybe use the Special:Contact/bug since it might be a bug you're experiencing, and tell them your problem.

I once went through a similar problem and it turned out to be a Firefox extension that was somehow causing certain things to not fully load on Wikia. However, you said that you've used several different browsers and encountered the same problem. If you're willing, you can use a different editor, like Classic or Source: Help:Editing