Several times the drum sequencer have bugged out for me. Steps I have recorded in a sequence and then removed them, some of the steps still trigger, and I can't remove them, ghost trigger?
The ghost trigger was a little bit offset as well, triggered between step 4-5. The weird thing is that the timing between the ghost trigger and the actual trigger of step 5 was a little bit off as well, as if it did not follow the tempo correctly.
So, as a test I saved the project, restarted KSP and loaded the project again... the error remained. BUT, then in another drum sequencer one trigger disappeared. It is active and lit, step 13. but no triggering of sound...
Similar things have happened to the drum sequencer for me several times, the way I can fix it now is to do Clr Ptn or Clr Steps.
Before I was fiddling around a bit with quantise and extending sequence to 64 steps and back to 16... maybe that triggers the faulty state... or something...
Running FW v1.1.7 build 473.