Problem playing Tiny Tower after update. Game Center login issue?

[dandan83]

Hey all. I may not have searched for this right, but I didn't find anything that I could use to help. It appears when I first set up game center I must have used a different ID than my Apple ID. I get a message saying "Game backup and achievements will not be saved until user **** logs in." I've tried to log in as that user but Game Center won't let me because it isn't a valid Apple ID. I'm very confused as to what I've done here. lol Hopefully someone knows how to work this out. TIA

Edit to include usefull info: I have stock iPad 2 16gb.