I had same problem several years ago. Problem was that I had two schedules set for the same times i.e. a B1 and a B2. At 7 AM system start of B1 which would run each zone. When cycle was complete it would run B2 even though scheduled for 7 AM start.
When dealing with the programing once per every couple of years, it takes a while to relearn the process . My mind was calibrated to think schedule A, B, C, not A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, C4
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