Logged in under a different name?

Hmmmmmmm......... Maybe someone else has selected the same screen name as you? I know that isn't supposed to be possible, but these are web sites designed by humans.......

It happened to me not too long ago and Tim explained about it being a hiccup in the FSM web system and it sometimes happens. That's why there's a "Not me, click here" space.

Like PlasticJunkie said, it's happened to me every so often.  And likewise, just click the "Not [username]" link.  I believe Tim mentioned that the admins get notification when that link is clicked.  At least, that's what I think I remember.