The timings of some MIDI instruments are saved in a weird way that causes them to not start at the same time in the MIDI data, but still sound like they start at the same time when listening to the file. Because the converter reads the MIDI data, the end result is a song with arpeggios in chords where there shouldn't be one.
As a workaround, the file can be loaded up in e.g. MuseScore and reexported as MIDI, which may or may not fix the chord timings.
The timings of some MIDI instruments are saved in a weird way that causes them to not start at the same time in the MIDI data, but still sound like they start at the same time when listening to the file. Because the converter reads the MIDI data, the end result is a song with arpeggios in chords where there shouldn't be one.
As a workaround, the file can be loaded up in e.g. MuseScore and reexported as MIDI, which may or may not fix the chord timings.