I noticed yesterday what is seemingly an off-by-one error (or something) in the vote reversal scripts. There were 4 posts of mine downvoted in quick succession, and the reversal script kicked in as I expected it would. However, the first of the posts retained the downvote:
I actually also recalled that this is the second time I've seen this happen. I just sort of wrote off the first occurrence as a fluke or coincidental vote timing between 2 users or something, but now I'm not so sure. Again I believe it was the very first post that was not reversed:
Bug? Or is something else at play?