Board Thread:Support Requests - Getting Technical/@comment-4618259-20180204001408/@comment-9605025-20180204002346

Unless you need the rich-text editor, try using the source editor instead. This issue with the rich-text editor is know and Wikia is working to fix it.

Relevent Threads: - Edit:
 * Thread:1386943
 * Thread:1387536
 * Thread:1388188
 * Thread:1389262

As mentioned in the above threads, this issue is know to occur when there are unclosed tags in a template. This is the case with Template:DiscussionBoxBegin.