Part Names

Hi there, I just updated to MuseScore3 today. I imported a score I had been working on in MuseScore2. I made some new parts, and tried to edit the part names by adding new ones. For some reason, when I add a new part name, rather than just appearing on the one part, it appears on every part (so if I name a part "tuba," every part now has "tuba" as the part name, rather than just the tuba part). Is there a way to fix this?