It was a case of the tap-too-quick, and I selected the wrong flag for a particular question. How should I handle this matter?
I didn't see any flags by you which seemed odd/wrong, so it probably got handled already. Also, there isn't a big difference between the flag types as far as moderator notification is concerned: we get notified, look at flag and post and try to resolve whatever problem the post may have (at least that's the idea, we all make mistakes now and then).
The answer in What to do if I mark the wrong flag? still applies though: If in doubt, post to Meta (as you did).