Concert Pitch Incorrect
It is incredibly difficult to explain, but the concert pitch on my version of musescore (the recent 3.6) is not correct.
I have attached the score with the issue in the trumpet part. You can see the trumpet and vocal lines have the same notes in concert pitch, but the trumpet is playing a tone higher than written.
(also, musescore won't open for me unless I open it through selecting a musescore file from my documents, so any help on that would also be appreciated)