[Serusers] Not Recognizing ACK

Running SER 0.8.12 on Solaris 8 -SPARC with MySQL installed. The issue that I'm running into is that when the originating GW receives a response and generates an ACK the SER doesn't seem to stop the timer for resending the message. If you look in the log, you can see where the server receives it, but the server resends the same response as if the ACK was ignored. It the attached case a 503 response is sent back, but the same situation occurs when other responses are sent. I was also wondering if there was any way to process 300 responses within the scripting vs. sending the 300 response back to the originating Gateway. Thanks, Mike