I flagged this question for being off-topic (app development) when I was working through one of the queues. When I was browsing later, I looked at the question again and started to flag it, when I saw that I had already done so.
However, the SE system had two flag options grayed out instead of just one. I know I definitely did not mark this question as a duplicate. I even checked my "raised flags" page to make sure.
Is this a bug? Or is there some other reason why the system thinks I've flagged the question twice for two different reasons?