Hi @landru, great question. From the sounds of it, your rain sensor is still drying out and hasn't turned off yet. I'm not sure if you've checked the history feed yet, but we could see if we maybe just missed seeing the "It has stopped raining" message.
Assuming your rain sensor is still active, we might need to clean it, adjust it's settings (a movable window that controls how quickly the internal discs dry out means, most sensors have a twisty collar at the base that either covers up or reveals the air vent, adjusting the speed of drying time and return to normal watering), and/or test it.
Just curious, what do you have the sensitivity set to? If it's at 1/8", can we try 1/4" or 1/2" and see the same feedback is experienced?
I'd be happy to review your account in more detail if you'd like to double check. If so, please send us an email to firstname.lastname@example.org and copy the URL from this discussion for reference.
Hope this helps!