Brightness Issue with my LG C4.

So the general gist of things is that my screen will dim down, but the OLED brightness meter stays at 100. When I lower it down to 0 and back to 100, my brightness will be reverted back to 100. But then it will dim down almost immediately once I tab back into my game. Anyone know a fix for this?

I have Peak Brightness off.

I'm in Game Optimizer

Energy Saving settings are off

Adjust Logo Brightness is off

AI Brightness is off