This is very interesting. I would ask neighbors to find out how long the previous owners lived there, and if they ever experienced anything out of the ordinary. Also, I thought realtors had to disclose if a house was haunted, but maybe not. My friends lived in a haunted house for years. The spirit was not evil, but every once in a while would let them know that it was there by opening all cabinets in the kitchen or flicking the lights. They just got used to it.