Percussion instruments sound like Wind Instruments

The subject line says it all.
Another thing I noticed is that the name of the titles that I've saved my recent pieces under have been changed to letter/number combinations that make no words or any sense. I've changed this one back, but there are others that remain changed by the software. This has only happened on the pieces that were open at the time the problems happened. All had been save previously. There was also a sudden shut down of MuseScore that the software did.

The instrumentation is:
clarinet, trumpet 1, trumpet 2, piano, piano, snare drum (marching), bass drum, tenor drum
You can see that the tenor drum part is on the individual part with the bass drum-I didn't do that nor do I know how to do that.