Sequence systematically playing the B timbre of a patch

Hi, is there a way to prevent a sequence from systematically playing the B timbre of a patch? (In addition to timbre A) This timbre is disabled in the patch as well as the stack (most patches), so I don’t understand why the sequence plays it.

I forgot to specify that the muse is linked to Ableton in USB and therefore that my problem is probably in the MIDI settings (multi mode ect..) Without USB connection the operation is correct.