Drumset playing wrong sounds

I am making a big band score, and I started making the drumset part when I realized somethings was off. All of the notes are playing the wrong sound. For example, Bass Drum 1 is playing a Ride Cymbal sound. Ride Cymbal 1 is playing a Crash Cymbal sound. Cowbell is playing a Tambourine sound. Closed Hi-Hat is playing a snare sound. These are just a few. They are ALL mixed around. Please help.