I’m having a similar issue. I’m not using a Daw, but sequencer 1 is triggering random drums.
At the moment I only have a tr8s connected by midi on the drum channel and an MS-20mini from sequencer 1 by cv.
When scrolling through pitches on sequencer 1, certain notes trigger a drum from the tr8s
Eg. b 2 will launch a hi hat but c 3 won’t