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I was recently noticed "serial voting was reversed" on MO. I am curious about how this works, and what this exactly means (I don't have the feeling that I did something wrong).

Note that I don't care about the loss of reputation. I'd rather like to understand what I did wrong, in order not to repeat it.

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    $\begingroup$ I think that if you have seen that in your reputation tab, you can click on "learn more" to get to the help center. And you can find links with some basic information in the corresponding tag-info.) $\endgroup$
    – Martin Sleziak
    Commented Jun 27, 2022 at 14:50
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    $\begingroup$ You can check an older post on this meta: What does "serial upvoting reversed" mean? (Although I am not sure whether this one can be considered an exact duplicate - since this question seems to be mostly about the question: "Did I do something wrong?" Most probably, the answer is no, nothing.) $\endgroup$
    – Martin Sleziak
    Commented Jun 27, 2022 at 14:52
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    $\begingroup$ I have not looked into this properly, but it's possible that this will happen more often than usual for a little while, in relation to this announcement? $\endgroup$
    – Tim Campion Mod
    Commented Jun 27, 2022 at 14:58
  • $\begingroup$ If you did something wrong, you'd have gotten a personal notice saying so, so nothing to worry about. $\endgroup$
    – Gerry Myerson
    Commented Jun 28, 2022 at 2:24
  • $\begingroup$ It seems I lost 70 in reputation from this correction. Probably from errors going back to the beginning of MO. $\endgroup$
    – Gerald Edgar
    Commented Jun 28, 2022 at 14:05

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It pretty much coincides with my reputation reversal of one vote on another site in the network. Normal serial voting reversals happen around 3am UTC, and I asked about it here - the response I got from staff pretty much proves @TimCaption's guess is right. This was someone who, completely by accident, managed to upvote a post of yours twice, and that mistake has been reversed now. It's extremely likely nobody did something wrong here.

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  • $\begingroup$ I thought it is impossible to upvote a post twice. Most likely, somebody liked one post, looked for other posts by the same person, liked these as well and upvoted quickly (say, more than 5 different posts). The software decided that this was a serial upvote and cancelled all these upvotes. $\endgroup$
    – Moishe Kohan
    Commented Jun 28, 2022 at 3:27
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    $\begingroup$ @MoisheKohan Please do read the post linked from the answer. It was indeed possible to vote twice under some circumstances due to a bug. $\endgroup$
    – Emil Jeřábek
    Commented Jun 28, 2022 at 5:06
  • $\begingroup$ @EmilJeřábek: I see, so it was a bug present in the system from the onset. $\endgroup$
    – Moishe Kohan
    Commented Jun 28, 2022 at 7:47

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