@YouTube why do you always unlike videos i’ve liked? i could like a video 3 or 4 times but everytime i rewatch it, it’s unliked 
That's odd. Just to confirm, are you able to see the video in 'Liked videos' section? What device are you using? Also, do you see this happening across devices? Keep us posted.
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no they don’t appear on my liked videos list, on an iphone 7 and yes this occurs on all three of my devices
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That's strange. While clearing your browser's cache and cookies clears things up on desktop, updating/reinstalling the app often fixes most issues on your mobile device. Let us know how it goes.
End of conversation
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