It may be caused by geographical, physical, chemical, microbial, animal and human factors. These all need to be checked out one by one. If the above reasons do not consider cause and effect, feng shui reasons.
In any case, when there is such a thing as a haunted house, the owner needs to check whether his virtue is flawed. Greed, jealousy, evil thoughts, killing, unfilial, disrespectful and other evil deeds. Everyone needs to be alert, repent and correct immediately.