Slurs not working on MuseSounds properly.

I am arranging a large piece for a Marching Band, but, this part of the clarinet music refuses to playback the slurs. The slurs in the rest of the piece are just fine, but the 2nd and 3rd measure of the screenshot refuse to play slurred, and sound very bad on the playback.

Help would be appreciated.

Btw, this part is 120 bpm, and its in f major.