Clock sending Midi notes?

I just got a DN and a Nord Drum 3p and i’m trying a new setup.

The MIDI chain is Launchkey mini > OT > DN > ND and OT is giving the clock and i use auto channel 13. Now the problem is that the ND is receiving Midi notes (D3 to A3) on the autochannel from the DN.
It stops when i desactivate the clock sending within the DN.

Any setting i should change or shall try a different setup? I would like to keep the ability to sequence the ND with the DN but i could also sequence with the OT.