Boot with extensions disabled (shift) and see if the problem persists?
I believe that extended keyboards have a different ADB profile that assigns the left and right modifiers different key codes, whereas their key codes are equal on compact keyboards. If the common factor is the computer, it might be an extension that's incorrectly using the extended profile.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.