Hi,
The beatstep pro sends CCs when stop /rec / start buttons are pressed, I think these messages can start or stop other sequencers. Default CCs are 51, 55, and 16 respectively. In the MCC you can switch this off, or change the MIDI channel in the 'Transports' section.. Could it be that these CCs mess up your Nord drum2 / other gear's programs?
Cheers,
Albert