I have PPS transmitters (one branded Oceanic and one branded Shearwater, but both the same other than serial #) and Oceanic Atom 3.0 and Shearwater Perdix AI computers and have had a Hollis TX-1. They all worked flawlessly with my PPS transmitters and I am very happy to have been able to invest in one type of transmitter that I have been able to use across different brands of computers.
Did you try to connect ALL of the computers to one transmitter at the same time and all work OK with the transmitter?