MS3 MIDI Import - Disabling "Simplify Duration" Changing Note Lengths

I'm creating a drum chart using a MIDI file, made in a DAW and imported into MuseScore 3. When importing the MIDI, MS3 automatically enables "Simplify Durations", which changes the MIDI note lengths I've set and splits the notes onto multiple voices, which I don't want. I have it set up so every note aligns with any other notes that occur on the same beat and they only extend to the next note, so there's no gaps or overlap, for legibility's sake.
Disabling "Simplify Durations" works to an extend and allows me to combine the notes back into one voice so it looks how it should based on how I programmed it. Except at a certain measure it begins extending notes (perfectly aligned and quantized in the original MIDI) to the next note of that pitch, creating massive tied notes and messing up the whole score. I can't for the life of me figure out why it's doing this to only notes on certain pitches and only after a certain measure in the song. I'm at my wit's end. Any ideas??

I've included the MIDI, the measure the issue begins is the end of 61 and onwards, and the pitches are seemingly only D2 and F#2