MacBook Pro 2015

Welcome !!

If the issue is presented in Normal Mode but NOT in Safe Mode

Suggest downloading the Application  Etrecheck  https://etrecheck.com  directly from a well Respected ASC Contributor. 

The application is free or paid from added features. 

Run the application with Full Disc Access ( Security & Privacy - Full Disc Access ).

It will take a Snap Shot -  both the hardware and software.

 The Report will Not Reveal Any Personal Information. 

Post back the Full Report - copy and paste - using the Additional Text Icon ( 3rd Icon to last )

We can have a look at the report for possible issues and may have possible suggestions to resolve the issues.

Any Third Party Applications that will interfere with the normal operation of the OS, alter, modify, remove or delete or attempt to do so is an invitation for disaster and may require a Reinstallation of the OS.

This includes AntiVirus, Cleaners, Optimizes, UnInstaller etc.

We are talking about the Builtin Keyboard ??

How to reset the SMC of your Mac and perform this action three time consecutively - then, test the keyboard.

If still happening - restart in Safe Mode - does the issue still happen ??

PS the screen shot looks like Big Sur - correct.

Welcome and thank you too :-))

Safe Mode does a number of things behind the scenes and without the need of user actions. Sometimes, when an upgrade is done - " things get out of shape " sort of speak on the computer. The Safe Mode put things right again

Do come back to the ASC Forums if / or when additional help is needed.