I found a few scores, which are matched wrong:
http://www.hwbot.org/result.do?resultId=634725
And all results from tzwrtzhs's on E6300 added to E2160. He has a lot of scores in this category on E6300 - it isn't only one mistake.
http://www.hwbot.org/result.do?resultId=634495
Another score from tzwrtzhs's.
http://www.hwbot.org/result.do?resultId=636258
Maybe now is the time, when for wPrime screen should be also necessary, not only validation, because on the screen everything is visible - some people have problems with matching to correct category.
Needs more proof:
http://www.hwbot.org/result.do?resultId=641382
http://www.hwbot.org/result.do?resultId=572523
http://www.hwbot.org/result.do?resultId=596665