It is not so common knowledge that you can also vote after the message disappears using the command /yes and /no, but agreed, it sometimes bugs out, if I had to guess it would be because too many people click on the vote very fast, but that's just a guess. Somewhat related to the kick system, I wonder if we could have the ability to cast votes on anything again and not just player IGNs. We used to be able to /vote kick <message> and essentially make a form of an in-game poll which is nice to use at times. Imagine wanting player input on making a decision in an event by making a quick vote poll in-game.
