lol. I think it depends on what is happening in the pool in general. Remember that downvotes mean that it gets redistributed to all other posts. That means that when a (especially a large) downvote goes on a post, the ones with very large payouts will go noticeably up. That is why all needs to be eventually sorted out so that the downvoting redirects to decent content.
This might interest you in regards to that circle.
https://staging.busy.org/@anomadsoul/ocdb-and-downvotes-or-a-newsteem-approach
I think That post went from $19.06 to $19.36 with my downvote. Still Doesn't make sense to me.
Yes I saw that post from ocbd so glad they are going to tackle this issue.
That's impossible unless some else upvoted in the same time window.
It was a very strange but you are probably right maybe at that moment another vote came in,