Isn't there a risk of duplicate accounts creating multiple accounts and participating in the contest ?
We are doing what we can to prevent that, but of course there is no bullet proof system. We had a minimum rank required to join in this late registration week, but that would also prevent honest players to be able to join, so we decided to remove it. Besides there could already be users with duplicate accounts in the forum so that would not completely solve it, and was preventing real users to join.