Very odd. This happened yesterday with a vote (appeared 3 times). Can't think of a reason for it - the only server-side change is the box AN sites on now has 1/2 the workload it used to have, a lot of other things have been moved to another server to free up resources. Maybe their are now too many resources ;)
Anyhow, it's fixed now, very easy to clean up when it happens, but I think I need to find out why it happens...
my orders are to sit here and watch the world go by