I was playing and this guy was teamkilling and dismatleing defences. An all around nice guy. So I voted to kick him and immediatly afterwards he voted to kick me and my voting disapeared.
It seems that if you start a new vote it cancels out any vote in progress or at least stops anyone from voting for the old vote.
Also this has probably been mentioned. I tried to kick another guy and he changed his name, vote passed but did nothing. The vote kick should be tied to his ip address obviosly not his name. This might have been fixed already, i don't know.