Dear customer,
Netro may not have over-watered your zone. Netro's water usage is based on zone area and it is the estimated value that may not be accurate enough.
However, using a flow meter can help to improve the accuracy of the estimation. If your flow meter is not accurate, the data estimated by it may be biased. Nevertheless, overall, Netro is doing its best to help you optimize your watering and reduce water waste.
Thanks,
Wency
Netro Support