Hmmm. Could it be that some legitimate registrations were not processed because of the sheer volume of fraud registrations?
In Wisconsin you can register at the polls so no one will be refused. All you need to do is bring your utility bill for one voting site, your grandma's utility bill for the next voting site and so on so that no illegal voter will be denied their right to vote fraudulently as often as they like.
Personally I think this is designed to hold up the voting lines so there absolutely is a long line waiting when the polls close and the buses from Illinois roll up to vote after closing time.