It may be related to the famous 301 view count where YouTube would stop updating the total pending further verification that the views are legitimate. See: https://youtu.be/oIkhgagvrjI This behavior was later removed in 2015, but I wouldn’t be surprised if something similar is happening here.
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[ 3.3 ms ] story [ 35.4 ms ] threadLot of people reporting similar months ago:
https://www.reddit.com/r/youtube/comments/15fvsu0/likes_are_...