This post shows how to run the new Keyboard Troubleshooter in the Get Help app of Windows 11. You can also access it via Windows Settings.

Both Windows 10 and 11 include a keyboard troubleshooter designed to diagnose and fix common keyboard problems. In most cases, running this troubleshooter fixes most keyboard problems without the ...

The good news is that your computer is neither possessed nor communicating with parallel universes, and the backwards typing can be solved very easily.