ALL apps and websites with video show wrong screen size.

Hi guys, would really appreciate your help on this one. As the title says, the videos play larger than my phone screen so I only see the corner of each video, like the system thinks the screen is bigger, it happens on mubi, websites with internal videos, YouTube plays OK at 360 quality but any higher and it makes the video bigger than my screen. Any ideas would be greatly appreciated, thank you.

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