For your reference, here are the reasons as follows:
1. Please check if the floor is too dirty;
2. The main unit will suck in liquids during cleaning. It will produce an odor if the dustbin is not cleaned promptly. After completing the tasks, please clean the dustbin promptly;
3. Please check if the mop has been cleaned and dried properly. It is recommended to clean the mop 1 or 2 times after mopping, and let it air dry before installing it on the mop bracket.