What did I do!! My screen is a weird color

It could indicate that you have enabled Inverter, or Smart Inverter. To deactivate, go to:

Settings -> Accessibility -> Screen and Text Size.

Find Smart Inverter and Classic Inverter. If one of them is enabled, turn it off.

Sorry, looking at your screenshot, I have no idea what you mean. What is not "original" about the colours?

This is because a screenshot with the Inverter enabled will appear as if the inverter is not enabled.

Oh, I see. Thanks. I didn't know that.

You are welcome.