Flow Meter: Typical Water Use

Installed a wireless flow meter - a snap; great product. Some zones are reading higher or lower than I would expect:
Zone with pop up rotar heads (fixed heads with the newer rotating streams instead of a mist) 15 heads (4 full circle, 8 half circle, 3 quarter circle): 23.1 gpm
Pretty big drip zone (at least 20 emitters): 2.7 gpm
these are very different from other zones with similar connections. indication of a problem?