Why is there water flowing out from the side of the Xiaomi Truclean W20 Wet Dry Vacuum during the self-cleaning process?

When the Xiaomi Truclean W20 Wet Dry Vacuum is performing self-cleaning by rolling the brush, it is in the stage of soaking the brush or pipeline, and there is a large amount of water flowing out. Due to other abnormalities or self interruption of the process, the self-cleaning process will be restarted, and the water will be circulated and soaked out. If there is too much water, it will overflow, which is an abnormal process. It is necessary to clean it promptly without affecting normal use.