My best guess would be that the site is doing a "whois" query for your domain name, and republishing this public contact information. Do a whois and see if it matches what was shown. It's public information, so there's nothing unethical about what they did. If you don't want this information available, ask your registrar about how to hide this information, such as behind a proxy (Third Party intermediary). Don't file false contact information with your registration -- in many cases that's illegal.