I think that's down to the way it has remembered/saved your search as I get a similar behaviour with "Camera" and "Turn off camera access systemwide" -- "c", "c

I think that's down to the way it has remembered/saved your search as I get a similar behaviour with "Camera" and "Turn off camera access systemwide" -- "c", "ca", and "came" suggest the Camera app and "cam", "camer", and "camera" suggest the system setting. I use both of these, and it looks like Windows has remembered I select one or the other at a given point, so is saving that suggestion. It also likely has built in associations for the default applications (notepad, camera, etc.) that you've overridden by selecting notepad++ at those points. If you select/locate notepad++ at the other positions, I wonder if it will start suggesting that instead.