Board Thread:Support Requests - Getting Technical/@comment-26544237-20190806193310/@comment-9605025-20190806200241

It appears to be a problem with Wikia's global CSS/JS. The wiki you are talking about appears to use the new image galleries. For those, the problem appears to be in the global CSS. However, I also checked traditional galleries and it has a similar problem; but it is because of global JS. Consider reporting this using this.

Regarding VisualEditor, it seems that something in the site's JS is interfering with the editor. I suggest contacting a local admin to get it fixed.