Suppose a person asks a question that is not valid, and repeats it many times with some changes. If I always downvote that question, is that serial downvoting or not? I think it should not be considered serial downvoting.
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If you deliver many downvotes to many different questions in a short time period, the serial downvoting detection algorithm is likely to fire and unwind them. If you think that someone is posting many duplicate copies of a question, vote to close as duplicate, or flag for a moderator, or both.
It depends from when the questions are asked, and when you down-vote them. If the user keeps asking the same question (with some variants) every two days, and you down-vote them when they are asked, it is probably not considered serial down-voting; if you down-vote 10 questions in 10 seconds, that is caught by the serial down-voting script.