Ghost Instrument appeared after a crash

I was trying to make my song, until I tried to replace one of the instruments and Musescore crashed. Opened it back up and hit play, and there was a guitar of some sort copying the melody of the trumpet. I can't get rid of it and it's driving me insane. It's to the point where if I try to play back only 1 instrument by highlighting the instrument, it's still there in the playback. Please help.