I had that same issue and found out that there are actually several (the number 4 comes to mind) timing programs on your control unit. When you set the days of the week and times to have irrigation you need to be sure you're using only one set of instructions. In my case the watering is always done at night and when my handyman checked he found that immediately following the end of the program timing my system would start all over again. Therefore, I was watering twice as much as I thought.
Give it a look but the control box can be confusing.
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