Bug grace notes

I've discovered a bug with the grace notes. When I first tested a 4x grace note snare, 1/8th snare, 1/8th kick on standard drums on a separate file, the playback sounded fine. When I tried to use this combo in another score, it sounded like 4x 2x 1/16th snare, 1/8th kick. I tried turning off swing and other tempos but it didn't make much of a difference in either test score and main score. Please help.