This may be entirely made up, but I remember hearing that the duplication detection doesn't apply if a submission doesn't get a certain amount of attention. Looks like the only submission to get more than 3 points was 297 days ago.
Haha, my bad! I actually did try to search around for it, but it didn't occur to me to check the FAQ. I even checked the github mirror of the code [0] (no idea how up-to-date it is), but I can't read Arc very well. It just goes to show you could probably plaster rules like that as a header over the entire website and people like myself would still look in the wrong place :P
I have read the FAQ before, so that's probably where I "heard it", but I didn't think to check it this time.
That's very true. I even alluded to that in my comment but took it out as off-topic. It isn't you, though, it's everybody. Disseminating knowledge to the community is hard.