The whois data for your domain is public unless you opted to hide it when the domain was registered. It means that anyone can see it because the register made it public for everyone to see. Some registers offer the possibility to provide fake data or hide it completely, a service that's sometimes free or not. You will have to contact your register to hide the info, then perform another query on Website Informer to update the data.
For more info, use the Terms of Service page. There is a support email as well on the page. Use it to get additional data.