No, I don't think it is "out of tune" per se... it's just another "G" something chord. I know it's not a G7 or G maj7... these I know. It is another form of a G chord... one I'm not familiar with.
Also, it doesn't always play the G chord that way. Seems BIAB throws it in randomly sometimes.
I haven't looked at the piano screen yet... I'll have a look after my turkey dinner.

Thanks Matt
/Bobby