My Stack Exchange profile page is showing a question marked as favorite, when I actually only downvoted the question. In the question itself, you can see that it has been not been marked as a favorite by anyone.
This entry, however, does not show up in my Stack Overflow profile page.
I don't know if any of the mods/admins took care of it, but the entry is gone now. The last thing I tried was Caled's comment of adding and removing the question from favorite (with a few seconds pause in between).