This might point to a database problem, but I'd consider this to be rather unlikely. It might be much simplier things - someone else sat on a computer where your account key was still in the cookie of the browser. Your account key might be so similar to someone else's that he mistyped it and got your one. Try to figure out what you can on your end, we will look into it at our end, too.
BM

Taking my name!!!
)
You could change the eMail address of the current account to something different, then request a new account with your current eMail address.
BM
BM