Keyboard typing extra adjacent letters

I have a Dell Latitude with an i7-10610U. The built-in keyboard suddenly started typing extra adjacent letters. For example, when I press Q, it types QA.

The issue affects multiple keys, while the number keys seem to work normally.

I tested with an external USB keyboard, and it works perfectly with no extra letters or typing issues.

Since the issue is with the built-in keyboard, I want to try fixing it myself before replacing the entire keyboard, since a replacement is quite expensive.

What could be causing this type of hardware failure, and what can I try to repair or clean first? Is there a way to fix the affected keyboard circuits/membrane or ribbon connection without replacing the whole keyboard? Thank you