Using multitrack mode, BT output active?

Hi I am trying to finesse the CQ-12T into my Ableton setup, but i am finding that the Bluetooth output is the channel that is outputting audio, not the USB channel? Is this normal or some sort of bug? It seemed like when I was using Stereo mode the USB output was playing the audio, but since switched to multitrack mdoe it’s now playing on the BT channel? What gives here?