@TeamYouTube these bugs are getting annoying.pic.twitter.com/x3JYIjuP4s
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That's strange. Could you try uninstalling the app, restarting your device and reinstalling the app? It often fixes such issues. Let us know if it does the trick for you!
Sometimes, I get another bug that when I pull up the next videos while still in full screen, the thumbnails are extra small. I have taken your advice as well so hopefully it works. 
Sure, it should work. If it doesn't we're just a tweet away.
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