That's strange! Is this happening across devices? Make sure that the app is up to date and try clearing the cache with there steps: https://yt.be/help/Cko1 . Restarting the device may also help. Keep us posted.
@TeamYouTube Bug
I tapped a link, I could see the vid but the bottom was a wide I was watching previouslypic.twitter.com/jpeTTQtOtA
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@TeamYouTube Also this. Happens when I'm viewing videos and channels, too.
End of conversation
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