@Modawg2k, if you have some free time, a mason jar test is the easiest way to determine what type of soil you have. If you want to geek out on soils, here’s a white paper for some light reading 
This is fairly common in drip lines, yet is technically a design flaw as trees and shrubs can have very different watering requirements; both due to plant type and root zone depth. There’s two things you’ll need to consider moving forward:
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Vegetation type – It’s best to go with the majority rule; do you have more trees or shrubs on this zone?
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Nozzle type – Do you know if each plant is using the same emitter? Do some plants have more than one emitter? In a mixed zone like you have, the drip zone might be designed to apply more water to some plants and less to others. If this is the case, usually the designer had a run time calculated that we might need to back into the app for scheduling and bypass the zone setup. If you’re not sure how the drip zone was designed and/or what emitters were installed, it might be easier to perform a catch cup test on your drip zone or use your water meter to back into the application/precip rate. For details, please refer to this community thread.
Hope this helps. Happy Watering!