It would have been because you used the same ip address as both curi and one or both of them.

Edit: Usually that's how the software catches multiple accounts belonging to the same person, but I went back and looked, and in this case you (as qqq) outed yourself as curi.

I'm a little confused. I did not reset my modem or anything when making this account. I don't see why it wouldn't have triggered the same thing. And also, wouldn't the accounts get banned right away, not at a random time later? Did my ISP one day just happen to give me the same IP I had months ago?

edit: Oh. I've outed myself lots of times...