buggy mission control shortcuts
Did you try double-clicking on the actual keyboard short cut for that function in System Preferences/Keyboard/Keyboard Shortcuts?  You can change the key combo at will.  Of course there is no guarantee they will take, just as your "Restore Defaults" did not take.

I use Spark, a free app that lets me map anything I want, and overrides the OS settings.  If there is a con flit (which shows as the yellow triangle/traffic cone), I change the OS conflict to some unused combo.

I complained to Apple that I could not change those keyboard shortcuts to "Open app X".  The response was that I should not try to do that, as the existing system was working as designed.

This is not a built-in cure using the native OS options, but it works.