Using UDP/TCP_Packet_Duplication by Ken Bocchino Acknowledgment not making back to device.

I am using the UDP/TCP_Packet_Duplication Updated 17-Feb-2017•Originally posted on 11-Mar-2015 by Ken Bocchino F5.

Now my problem is that I am seeing the duplicated packets but the devices are not receiving the acknowledgment back. I can see that the acknowledgment is being sent it's just not being routed back to the device properly. Any help would be great. I have snat enabled and have automap chosen is this what I should be doing or is there something that I am missing.