Why does the Mijia Smart Evaporative Humidifier Pro not shut down after reaching the set humidity?

The Mijia Smart Evaporative Humidifier Pro automatically adjusts the humidity based on the measured humidity after reaching the set humidity.
For your reference, here is some information:
1. When the current ambient humidity exceeds the set humidity by 3%, the machine will continuously monitor the humidity value for 1 minute. If the humidity remains above 3% for 1 minute, the machine will stop. If the humidity falls below 3% within the 1-minute monitoring period, the monitoring timer will be reset.
2. When the humidity detects that it is below the set humidity, the machine will immediately start operating.
Note:
Avoid manually covering or blocking the humidity sensor, as this can result in inaccurate readings and improper operation.