Could you please let us know the LED status of the timer which is offline?
You can adjust the rainfall data through Discover page, tap the "+" button on the upper right corner and select"Correct rainfall". Netro support three weather providers, which you can choose in settings->controller->weather provider. The default one is NetroWeather.
Of course, all weather forecast could be wrong. Netro tries the best to provide accurate watering schedule even with incorrect forecast. First, we periodically update the weather data, once the weather data is changed, we update the un-executed schedules ASAP. Second, we re-check the weather data for the past, update our model, and adjust following schedules accordingly.