Automatically set full screen resolution to monitor resolution.

I’m surprised I can’t find a way to go about this.
Normally when you set a game to full screen it will set it to the monitor resolution, but the Set Fullscreen Mode option sets it to a much lower resolution. And this doesn’t improve even if i run Set Screen Resolution beforehand.
This only happens in Fullscreen, in Windowed Fullscreen it is set to the monitor resolution.
I run these standalone and always run Apply Resolution Settings at the end with command line override unchecked.
Why does fullscreen always get overridden to a lower resolution?