Marching Tenors Spock

Helloo, I've been using a drumline add one thing with musescore to write warm-ups and cadences ect. for my drumline. We've recently upgraded to 6 drum tenors from our 5 drum ones. When I try to write for the 6th drums however, it will drop back down to drum 1, unable to go past a high G (if I were in treble clef) where I would need a high B for the 6th drum. Does anyone know how to bypass that? I don't care if playback works either. If anyone knows anything it'd be greatly appreciated!
-Chris