Multiple invoices that net to 0, still processes the debit amounts instead of coming off as 0

We have 5 invoices with 3 different suppliers. 2 of the suppliers have an alt payee of the 97797(which is the 3rd supplier). The total of these invoices nets to 0 ( which came from a credit on one of the vendors). Every place we look, it shows us a net of zero but when processing the payments, the system wrote the checks for the debit amounts. Any ideas on why this payment won't come off as a zero?

We did verify P0400047 has the processing option number 5, on the defaults tab, set to 1.  Anything else we can check?