In YouTube videos, there are comments and two popular ones stay on the top. I see that for some hot videos on political views (like this one, which is very hot these days), popular comments disappear and less popular appear (though, they support the same idea). I have also seen the same here, where video likes were not accounted and even slowly and systematically decremented. How is it possible and can this be traced somehow?
I guess that there may be a limited history of comments and the top comments disappear as they are removed fall out of the history.