Sony Vaio keyboard errors

My friend's Sony Vaio laptop is giving keyboard errors - substituting the incorrect characters when typing.

For example if I type the name "George" it comes out "Ge6rge".

When I connected an external keyboard it worked fine.
I know that there are ways to re-map keyboard keys. But if that was what was going on here, wouldn't it also affect the external keyboard?

Thanks

Any help here:
https://us.en.kb.sony.com/app/answe...the-notebook-keyboard-is-not-working-properly.

That article suggests Numlock may be enabled. I think that is the issue. Thanks!