Playback does not play the correct rhythm, but only in a specific section

I'm currently writing a piece where this particular section is written in 4/4, and I have a unison rhythm with a quarter note, half note, quarter note. When I listen to the playback, it very distinctly and clearly plays quarter note, dotted quarter note, dotted quarter note. The closest I've seen to this is rushing of 8th notes in some sections, but this is the first time it's just straight up making up rhythms.