Board Thread:Support Requests - Community Management/@comment-4691926-20140925104022/@comment-5413643-20140925124446

They're not new user groups, but ones renamed through system messages. You can go to http://fantendo.wikia.com/index.php?title=Special%3AAllMessages&prefix=User-identity-box-group&filter=all&lang=en&limit=500 on your wiki, and then you can find the sysop box to rename it.