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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:

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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:

enter image description here

Bug? Or is something else at play?

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May be the one missed is a legit downvote, from some different user, but in same time range ?? – Habib Nov 8 '13 at 14:54
Perhaps that vote wasn't a serial vote. In any case, if you suspect serial voting that wasn't reversed by the script you should just flag for moderator attention so they can look into it. – Servy Nov 8 '13 at 14:54
@Habib: That was what I thought the first time, basically, but since it's happened twice now I'm wondering if it may be a bug. – eldarerathis Nov 8 '13 at 14:55
@Servy: I've already flagged this (for other reasons), but that seems like an inappropriate way to report what I currently suspect is a bug. I don't really have any way of knowing if it's a bug for sure, but the pattern is consistent, so I'd rather report in case it is. – eldarerathis Nov 8 '13 at 14:57
I strongly suspect that this is just an extra downvote not in the same series, not a bug. – Martijn Pieters Nov 8 '13 at 15:03
up vote 7 down vote accepted

Martijn has it right: the algorithm reversed only downvotes that were inside its detection window, so this is no off by 1 bug.

The Community Team has taken care of the rest. As usual, contact a moderator after 24 hours if the suspicious voting continues or if you see anomalies that haven't been reversed - they'll be able to sanity-check the situation and pass it on if there's a problem that needs our attention.

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Sorry if I seem dense for asking this, but when you say Let the community team take care of the rest are you suggesting that the one vote in each case that was not invalidated is something that I should have flagged because it was part of the serial voting incident? Or is it a completely unrelated coincidence and not something I should act on at all? – eldarerathis Nov 8 '13 at 16:15
See my edit, @eldarerathis. A single downvote isn't usually considered "abuse"; the five you got after that would be (and were) though. – Shog9 Nov 8 '13 at 16:18
@Shog9: Okay, so the logic is basically that the first vote is considered legitimate on its own merits (i.e. treated as a "single downvote"), even if it is subsequently followed by a series of others in quick succession, from the same user, towards the same recipient? Am I understanding that correctly? – eldarerathis Nov 8 '13 at 16:20
In some cases, yes @eldarerathis. This isn't true across the board, and there are certainly behavioral patterns that inspire much more... greedy... voting invalidation. But in a lot of cases, the first vote is arguably legit - it's after that that things start going downhill... – Shog9 Nov 8 '13 at 16:30
Alright, thank you for clarifying that, @Shog9. – eldarerathis Nov 8 '13 at 16:32

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