Okay, Blizzard support responded and said that the splitter I am using is just a basic splitter and shouldn't have any effect on it. Probably should have done this a while ago, but I decided to see if there was a specific chain that was causing the issue. To do this I bypassed the splitter and ran each individual dmx chain to the dongle one at a time. I ended up finding one specific path that seems to be causing the issue. It is connected to the house lights which are ran by and old unison dimmer control module. This is speculation, but I imagine there is some sort of feedback or conflicting dmx signal that is being sent upwards to the dongle from the dimmer control module, and when the dongle gets it on boot up it doesn't know what to do. Any ideas on way to alleviate this at the dongle with some sort of setting or anything else?