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[–] OhrReally 2 points -1 points (+1|-2) ago 

They aren't showing you repeat videos by accident.

There are several reasons Youtube shows you videos you have watched previously. One reason is for them to help bin you into categories of people who watch Videos comprehensively, people who turn on Videos in the back ground while they do other things, and people who have memory retention issues due to medications or drinking.

This is one of the methods they use to build a psychological profile of you for better advertising and socio-political manipulation of you later.