Watch History showing videos that I never watched

So recently I checked my youtube watch history and it showed videos that I never watched. Looking at the types of videos in the history I am 100% sure someone else is using it (may be for monetary purposes), but don't know how they are getting access. Things I have done: I have MFA setup in my account. I reviewed the devices/logins and its only from my PC and nowhere else. I have revoked third party access from unknown services in my Google Account. I still cannot figure out how they are accessing my account. Can some one please point where/what to investigate next and also possibly how to clean this situation. Can browser extensions be responsible for this, if yes can someone please explain how?
http://dlvr.it/Ryr4TP

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