It also happens when an account votes on a different IP then comes back to an IP where another account voted. If you're the only one on your IP, then that wouldn't explain it, lol.
Like, my brother lives away at a university during the week, where he votes. On the weekend, he comes home, where I sometimes vote. If I have voted too recently and have a voting bonus on one of the sites, he will have a negative timer until I lose my voting bonus, or something like that? It gets weird since I can still vote as long as there is no cool-down, but it seems like he can't until I lose my bonus.
