How do you Fix my Mac screen recorders from just recording a Black screen and only showing my mouse I use programs for trying to record a game I play on my mac but it only records a black screen?

This is probably due to the fact that the program you're trying to record is restricted and you're not allowed to record it. But fret not, you can still record it via ScreenRec.

Previously available only on Windows and Linux, ScreenRec is now available on Mac too. Its a free screen recording software that offers premium features like free cloud storage and HD quality recording. You can download ScreenRec from its official website.