Board Thread:Tapped Out Help/@comment-90.206.161.41-20140301220948

I'm on level 10, and just came to check on my world and I noticed that the account name wasn't mine, so I logged out and went to log back in but it put me back to level 1. My fiancé checked my Springfield on his (we're neighbours) and my Springfield is suddenly under this new name, not mine. Any idea how to get it back? 