As Pat stated, "It shows in the MLS."
The MLS is the only database of reliable, timely, accurate, relevant, comprehensive data. AND it IS the database for which REALTORS(R) have reponsibility. Data apppearing anyplace that is not a real estate professional website such as Trulia, can be fabricated. altered, spindled and mutilated as the website onwer(s) choose.
If your time has value, you should rely on the MLS for factual data and the other wesites for entertainment. and "Why?' should cost extra.