We have the "on hold" grace period for closed questions, it lasts for 5 days. It is used to signal people that we allow them to fix the question and solve the related problems. Sometimes they don't: the question can be unsalvagable, or they can simply miss the chance, doesn't matter. But sometimes the questions do get improved. In this case, unless the question was edited and reopened very quickly, they can get a bunch of (down)votes related to the first version of the question.
Then, when it gets reopened, the downvoters won't get automatically notified, and likely don't withdraw their do…