Output speed with HH4 and DFD Splitter

I have a DFD 124 Splitter. It works with 4 other boards I've tried, but does not work with my HH4. I have contacted DFD and they said that the box is fine (it's brand new) and if it works with the other boards, it's a hog problem. I can send a signal direct to my fixtures, and if I switch to use the Splitter, it either won't show me anything, or it shows some weird signal s that I'm not sending.

Does anyone have any thoughts on where I can find the answer to my problem? My hog is on the latest (I think it's 3.6.0).

Thanks!