To help narrow down the issue:
- Where are the incorrect symbols appearing: in all apps, only one program, or only on certain websites?
- Does it happen every time you type those keys, or only with certain symbols?
- Can you give an example of the key you press and the symbol that appears instead?
Since you already checked the language and Num Lock, also check the keyboard layout.
Go to Settings > Time & language > Language & region > your language > Language options, then check under "Keyboards." Remove any keyboard layout you do not use.
You can also press Windows key + Space and make sure the correct keyboard layout is selected.
If the issue still persists, does the same thing happen with the On-Screen Keyboard? Press Windows key + Ctrl + O to open it.
Click "Add comment" to let me know.
Thanks!