For some reason, when I opened my favorites, there was one that I never added. It's called Taking Stock and I am absolutely sure I have never even seen this comic.

i don't think there is a way to remove favorites right now. you might be stuck with it until they fix all the new bugs that came with updating the site. it's strange that you never added it as a fav though. possible database error or maybe some one fav'ed it for you. might want to change your password just in case.

That's weird. All the other favorites are there, right? Is that odd one out still there after logging out and logging back in?

Did you click around in the faves thread in the help section? The author of Taking Stock made a link in there (as an example), that auto adds her comic to your faves when you click it.

All my favs are still there and I never went into any other forum

You too?! I've never heard of "Taking Stock" and it suddenly shows up in My Favorites lists! I finally deleted it after some poking around, but it does seem rather odd that it just appeared, especially in more than one account.

Is someone messing around with the accounts? Possible security issue...?

Me too.
Taking Stock, crazy.