Youtube fullscreen splits diagonally on my MacBook Air Sierra

I watched Youtube on MacBook Air with Safari, it played 720p60 and when I go fullscreen, the video would splits diagonally. I didn't know what to do. Can you guys help me? But when I capture using Shift+command+3 this problem didn't show up.

User uploaded file

Then I capture with my phone

User uploaded file

Can anyone help me with this issue?

thanks

MacBook Air, 10.13.4

Posted on May 9, 2018 10:02 AM

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Youtube fullscreen splits diagonally on my MacBook Air Sierra

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