Board Thread:Support Requests - Getting Technical/@comment-28339536-20161030204422/@comment-168424-20161102010310

Sounds like you're hitting bugs with these browsers. I would report your findings to Special:Contact/bug. It may not be Wikia's problem, but they can at least look into it.

It's interesting you don't get the parts that are most likely to be Javascript driven like the Wikis drop menu, Search entry, user drop menu, and notifications. This may be a clue that it has nothing to do with CSS.