Alerted Zillow of a potential bug. Followed all their steps to remedy (uninstall, reset settings, etc) but it didn't work. Showed them that redfin and mytheo we're showing dozens of new listings for the same area and search criteria. Zillow denied it was a bug. As an avid user I wanted to help Zillow by reporting and providing plenty of details, but they had no interest in looking into it. Redfin just found a new user.