Zillow sucks. When I listed my house last year, they had the info all screwed up. Per Zillow my house was 500 SF smaller than any other website...and the tax appraiser's office. Also stated $600 plus monthly HOA fees. There wasn't an HOA. I'm sure it turned a few potential buyers away. Same thing happened the the guy across the street.
My realtor said that was pretty common and virtually impossible to get them to change it.