Shift Key toggles Mute

I’m using 11.3 64 KDE upgraded from 11.2. Every time I hit the shift key, the mute toggles. I’ve already tried changing the settings for kmix under global key shortcuts. Any ideas on how I stop or change this behavior?

This also was happening before I upgraded.

Put ‘Shift’ in the search field in the section ‘Standard Keyboard Shortcuts’ and also check ‘Custom Shortcuts’