All of a sudden my CNTL key in APub turns the Cap Lock on and off. I have not tried to reboot but have quite APub and brought it up again with the same result. I have looked through shortcuts and other APub preferences but found nothing. Perhaps some of the strange things that APub does when it gets "tired." I'm working in Big Sur that also may have some bugs.
PS: I rebooted and it still occurs before I bring APub up, so it must be some setting in the OS - yes a Keyboard Pref.