Hmm, that's odd – have you tried relaunching YouTube app? This usually fixes minor glitches like this. Also, you can check the app for any updates and try reinstalling it if there's none. If none of these help, let us know so we can continue troubleshooting.
@TeamYouTube whenever I go to watch a video on my phone, the place where the video should be is black, but the audio still plays.
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Relaunching helped, thanks homie
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