Duval county official says that the machines are coming up with more "under votes" this time when the ballots are run again. This points out that the hanging chad problem is in full force. Voter responsibility to ensure that the card chads are fully punched is still the rule that should be followed under this system. Another reason to mistrust the manual recount process based on punch cards. However, the real issue is that the non counted votes (undervotes) can not be identified from one running to another. So some votes may be counted twice when recounted.