I have been having the same problem from the time I first used the smart watering schedule. Duplicate watering schedules running back to back for an excessive duration (almost 90 minutes per schedule for an average 5 station front lawn). Orbit has been aware of the issue for over a year not but has not been able to roll out a fix. Meanwhile, my water usage is through the roof when I use smart watering (the main reason I purchased the timer)
Orbit, PLEASE address and fix this issue ASAP!