Windows 10 The function keys on my keyboard are constantly on.

[User8272689498]

The function keys on my laptop are constantly on. I don't have an Fn Lock key on my keyboard and I don't hit the Fn key but it turns on without fail. I tried to turn my screen brightness down and it puts the screen into fullscreen. If I hit the brightness up button it makes this weird command, coding box pull up on my screen. How do I stop this?

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