When you add a site to your organisation, we recommend you declare all related URLs/domains.
This is important, as it prevents them from appearing as Referrer sites.
All the URLs that are part of the same domain will instead be considered Direct traffic sources.
If the URL for your site is not declared properly, it will be considered its own Referrer site.
To check that all your URLs are properly declared, go to the Tools section of the Data Management Portal.