this is absolutely a hack!
This happened to me months ago. Judging from google's response when I advised them of the issue, I was one of the first to report it. At least that's the impression they gave me. But please everyone, do not write this off as a bug or something else. Since my google accounts were hacked the following things have happened. My credit card was hacked, someone tried to log in to my iTunes account and my identity has been stolen and used in the UK. It took a while for these things to happen - around 3 months after I first started getting kicked out of my account. Don't listen to what google are telling you! They are not being honest with you.