Unexpected watering change

All of the sudden my water bill jumped up $20 more than usual. Upon checking my watering times for some reason my schedule for watering my fruit trees was watering for over 7 hours. I originally had it programmed for 2hrs once a week. I cannot find any reason it changed the schedule to increase the watering to that degree. Obviously I corrected the issue but cannot figure out why it even did this. Curious if anyone else ever had this happen?