1
Open Command Prompt, then paste in this command and press Enter:
msdt.exe -id KeyboardDiagnostic
Run that Keyboard Troubleshooter to see if that can solve the problem.
2
If that does not resolve this for you
Open Device Manager
Expand the Keyboards section
Right click your keyboard and choose 'Uninstall'
Then restart your PC
3
If the problem is not resolved.
Open the Settings App.
Go to Accessibility - Keyboard
Ensure Sticky Keys, Filter Keys and Toggle Keys are all disabled.