Thanks for the file, it was a help in seeing how you have things set up. This is what I'm seeing. 
There are 2 instruments, the bd/tam combo and instrument 17 both assigned to midi channel 10. Although instrument 17 is not used in this score. Instruments 12-14 and 18 and percussion are all assigned to midi channel 8. Instruments 12-14 and 18 are on different levels of the marimba, xylo, and percussion staves. The percussion instrument is appearing on the percussion staff layers 3 & 4, not on layer 1 with the rack combo b on layer 2 and on the vibes layer 2. The vibes layer 2 does not have a percussion midi map assigned for use.
I'm also seeing crotales and xylo/glock both on midi channel 5. Both are used on the xylo staff.
From looking at the file, I'd say the problem is in the number of midi channel conflicts. Multiple instruments assigned to playback on the same channel and several of them don't have instrument names, just numbers. To solve the issues, first make sure all instruments have easily identifiable names, remove any instruments you know will not be used for this file or others for the show, and assign percussion midi maps and layouts to all of the non-pitched percussion instruments.
Let us know if this helps or if you have any further questions.