I flagged this question with the reason "This looks like brainstorming/idea gathering..." since I can't vote to close yet.
Weirdly, when I opened up the flagging menu again (I can't remember why) both the "closed for another" reason option and the "it is a duplicate" option were disabled, both with a warning saying I have raised this type of flag already. You can see this in the image below.
What's up with this behavior? Are both supposed to be disabled for some reason? If so, shouldn't the option I didn't click have a different warning?