Hello,
Please run Keyboard troubleshooter from Settings app > Update & security > Troubleshoot. See if this helps you.
If that doesn't helps, try this:
- Press Windows + X, select Device Manager.
- Under Device Manager, right click on your keyboard device/driver and select Uninstall. Click OK.
- Then click Action > Scan for hardware changes.
- Close Device Manager and reboot.
Also, go to Settings > Ease of Access > Keyboard. Make sure Use Sticky Keys is turned Off.
You can also try attaching external keyboard or check the problematic keyboard by plugging it to other devices, if possible.
If nothing helps, go to your laptop manufacturer's website and download latest keyboard drivers for your system mode and install them.
Hope this helps!