Problems with authorization

I went to sync my iPod today, and for some reason got a prompt that it needed to be authorized, then got a message that I have 5 computers already authorized. Recent changes: updating iTunes. Syncing iTunes to google play for my tablet (is this the issue?)

Even after I deauthorize all computers, I re-authorized the one I'm on. When I went to sync my iPod it said I needed to authorize, so I did. I then get a message that I have 1 of my 5 computers authorized, THEN I get a message that I can't have more than 5 computers authorized! How can I have 1 of 5 and more than 5 at the same time?!??!!