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When going full-screen on video, the browser doesn't show the full-screen the first time

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When going full-screen on video, the browser doesn't show the full-screen the first time.

For example, when I want to view a full-screen video on YouTube/Disney/Netflix/Prime Video, I select the full-screen button as usual. However the top left-hand side corners always show a thin blue hue. The thin blue hue only goes away when I leave full-screen and re-select it.

Any ideas on what might be causing this? My browser is up-to-date

When going full-screen on video, the browser doesn't show the full-screen the first time. For example, when I want to view a full-screen video on YouTube/Disney/Netflix/Prime Video, I select the full-screen button as usual. However the top left-hand side corners always show a thin blue hue. The thin blue hue only goes away when I leave full-screen and re-select it. Any ideas on what might be causing this? My browser is up-to-date

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It would help us help you if you provide a screenshot of the issue.

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This is the top of a Netflix TV show when I full-screen the first time. Notice the small line going across the screen.

If I go out of full-screen and then go back in again, the line is gone.

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i have the same problem