Women's MuseSounds voice cannot go higher than a G#/Ab4 (Playback)

hopefully self-explanatory, but no matter which dynamic level or voice type (ahh, ooh, mmm) i choose, the Women's MuseSounds voice is inaudible at a G#/Ab4. I know that there are a lot of bug and errors with the Choral MuseSounds pack but this one doesn't have a workaround that I can notice.

also, the example uses the normal ahh voice, and mp->mf the whole way through. nothing special