Is there MIDI output of the note as well? I would check that if so since it may be possible that the pitch detection simply doesn’t work well on the sound in question. ie: the note is being properly generated but the sound in question has overtones/fx that make it harder to recognize. I would think the code that handles chromaticism is not related to audio generation code per se so it would seem strange that it worked on one machine and not another. A bug is possible of course but just something else to check.