So, I was on a YouTube video, and I expanded all the sub-comments on the top comment, and all of them were liked by me, even though I never watched the video before. This occurs on all popular videos, only on the top comment. The comments aren't liked until I expand the comments:Unexpanded:Expanded:Video from screenshots: https://www.youtube.com/watch?v=kffacxfA7G4
Tons of liked comments
youtube
YouTube is aware of this bug. They are working on a fix.