Two parts stuck together

I’m having a strange problem with Dorico 5. The Percussion 2 and Percussion 3 parts are somehow “stuck” to flute 1. When I try to print or edit the Percussion 2 and Percussion 3, Flute 1 also appears in the part. I have no idea how this happened or how to unstick them. Help would be MUCH appreciated. The file is available here

This is a symphony, and I can’t upload it because the file is too big. Thanks!

Aha - I figured it out! The parts were connected in “Layouts” under the set up menu. Wow - that was weird for a while.

I’m not at my computer, but in Setup mode, select the Percussion 2 layout in the right panel and make sure that the checkbox for the flute player in the left panel is not ticked. Then do the same for the Percussion 3 layout.

Thank you!

On a totally unrelated issue (I’m wearing my “transposition police” hat here:
Out of curiosity and to get a feel for the style of the piece, I chose a few bars at random and hit playback.
You might want to check in bars 25 and 27 in case you want the semitone clash in an otherwise unison passage.
Also, in the third-last bar of the whole piece, the G sharp in the Horns in F sounds as a concert-pitch C sharp, while the prevailing harmony for the whole bar is an F major chord.

Good catch - thanks!