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everytime someone votes on a comment it can change all it needs is a -1 rating to be thumbs down and a +1 to be thumbs up.
So say for example a comment is at 0 and someone votes thumbs up, it goes to thumbs up. then the next day two people vots thumbs down, then it's thumbs down. with millions of people on YT everyday it's pretty normal if you think about all the people commenting and rating.
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