Board Thread:Support Requests - Getting Started/@comment-6059729-20130512203117/@comment-37290686-20181112230742

You cannot add wikis to "My Favorite Wikis" manually, even if you have contributed to them. If there is a wiki you don't want to be listed, remove it by clicking on the garbage can next to the wiki name in the "Wikis you've contributed to" section in your "About Me" (access by clicking "edit" on your profile).

Interestingly enough, wikis that you didn't technically make an edit at (mostly caused by changing your avatar on a wiki you never edited at before) can show up in your favorite wikis. Also wikis don't necessarily show up in that list, and it can even reset to showing only one wiki.