Hi @Aine ,
Welcome to Microsoft Q&A.
You can try following methods to fix the keystroke mismatch:
1 . Press the Num Lock buttom on your keyboard to see if you can fix the error.
2 . Check if there are certain keys that are not popping back up when pressed, causing the laptop keyboard to go haywire.
3 . Check settings-->language-->keyboard to see if you have selected the right language
Best regards,
Molly
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