Notes don’t play

I’ve been writing music with the MDL extension for a while, and I love it. However today I came across a new problem. Certain instruments and voices will only play every other note. For example, with the MDL drumset, all instruments under voice 1 play fine. But the bass drum only plays every other note. Is there some sort of setting or something i may have accidentally changed? (I opened a new score to test and still had the same problem)