My keyboard is pretty basic so it has no transposition facilities.
I thought to export a midi file of my previous .not file and look at an event list.
The results shown in the attachment are a bit odd. For example where do the Key Aftertouch messages come from. I do not have Key Aft ability on my keyboard. And why are there repeated notes at the beginning.?? Something strange going on.
Martin
ps
I just produced an event list from your .not file where you show accurate chord names. I got the same result (ie with key aftertouch etc). So although this is unexpected, it is nothing to do with the chord name transcription evidently.