Roughly one hour before the schedule runs the system will determine if any zones in the flex need to be watered. You might have just miss this cut-off.
I believe what you are seeing is still a forecast for watering, and since you just missed the cut-off it thinks that it is watering today. Tonight when UTC rolls to tomorrow, the graph should properly show it watering tomorrow since there will not have been any observed irrigation today since your Iro did not actually water the zone.
Hope this helps.