Gallons Used Seems Way Off - Help

I am new to Rachio. Just installed it a few days ago and it’s pretty awesome. It would be great if the app had a database of all the various sprinkler heads by manufacturer and model and their associated specs so that the calculations can be more accurate. Also, I didn’t see an option to choose more than one type of sprinkler per zone or a setting to state how many heads are in the zone.