Why does the Xiaomi Smart Dehumidifier Lite power off when it is below the set humidity level?

When the dehumidifier reaches the humidity level and powers off, it needs the actual humidity level to be less than -5% of the set humidity level before. For example, if you set the dehumidifier at 55% humidity, it will take at least 50% for the dehumidifier to shut down. At this time, the dehumidifier operates at a low speed, the compressor keeps working, and it will not continue to dehumidify to maintain constant humidity. The speed of the compressor differs between the Smart mode and the Sleep mode, and the dehumidification effect differs. If the dehumidification effect in Sleep mode is better than the Smart mode at the time of operation, the unit can be shut down before the humidity level is reached. In order not to cause frequent switching on and off of the machine, the machine will stop only when the actual humidity is lower than the target humidity.