stuff opening on login

Any apps that are still open when you shutdown will open when starting up. Also some apps have their own start at log in settings which don't show in login items. Spotify being one that comes to mind.

Though you don't mention exactly which programs startup, sometimes apps will have their own app settings you have to disable to stop them from opening at login.

Are you quitting Photoshop and Capture One or just clicking the red close button?