Isn’t their a 1 channel mode with your Nord Drum ? (Different notes)
You can’t record several midi tracks (possible to record several audio tracks, triggering them with notes C2-G2).
But you can trigger and record Midi Plays Free tracks from another midi track, using notes C3-G3.
Try with midi track 1, channel 1, and set Audio Track channel to 1 (MIDI > CHANNELS).