TOPIC: Rejected Transaction gets marked as Free

DT 2.8.4

So I am noticing one guy attempt to register multiple times and continues to put in a bad address so Authorize.net rejects the transaction. Then I notice that a confirmation gets issued by DT for showing he has been marked as Free 0.00 amt. His registration is sitting visible as a record with no confirmation number, no transaction ID, method of payment is blank, and auto marking him as Not Attended instead of leaving that entry blank like the others. So I get his payment information and take care of him over the phone. I manually enter his payment information and transaction id. I create a confirmation number and increment it by 1. I go to the main configuration page so that I can increment the global ticker [Confirmation Starting Number] by 1 so that there are no issues with duplicate confirmation numbers. I then notice that it is already incremented by 5 which is the number of times he failed to register. I assume it is taking incomplete registrations and incrementing even though it does not save the registrants information to the database. So.. Q1: why did it issue a zero amount incomplete confirmation? Q2: Is the auto increment on incomplete registrations what is supposed to happen?