Thanks Tom, it is not any ignorance but a result of a workflow - this piece was written long ago, and I had a handwritten score. Then I did a MIDI performance off of that. However now I am trying to do a publishable score in Finale, and so am importing that MIDI score. It is a tiny bit less crazy-making than just re-writing the piece into Finale.
Amusingly, it is NOT less crazy-making to do another piece I am working on, which was in 12/8 in major section but in the MIDI I did it in 4/4 and used triplets!!! This was insane, and results in utter chaos if one tries to convert that into proper notation. Finale completely breaks down into gibberish. Also complete mental breakdown of the composer will result. So on that piece I am just re-writing it into Finale off the old score written on paper. Even though I have a MIDI file of it. A boring explanation I know, of an insanely overcomplicated process.