I am using a usb dongle dmx directly to the express.
I would look at your origional profile and make sure that you don't have a hidden controller assigned to channel 1. I doube that Vixen can send the same channels to multiple controllers which would mean that the first one defined gets the first channel and the second one gets the rest.
I don't have a whole lot of experience with Vixen yet but it appears that the beat track may in itself be acting like a controller in that profile and moving all of the other channels up one.