This has happened to me twice recently. One was serial downvoting here on MSO by a... certain user glares... and the other was serial upvoting on SO. When they get reversed, it lists out a ton of "undownvote" or "unupvote" events in my history, like I don't already have enough entries from all the "downvote" or "upvote" events. When the serial vote checker runs, could it not group all of these events into a single, expandable event?
Let's replace this ugly screen:
With this somewhat nicer looking screen:
It will also give users a somewhat better idea of why all these upvotes/downvotes were reversed.