Print Score

I tried to print an entire score for the conductor. My score has 20 parts but only the first 14 parts print out. When I export to pdf, only the first 14 parts appear in the score. Also, my score has 2 drumsets but only the first drumset appears as a part, drumset 1. Drumset 2 appears as a part when I view the entire score but is blank as a part.