A couple of days ago I get in a small issue working on a google analytics account and the referrers showed into the traffic sources. GA was showing the domain monitored as a traffic source without no apparent reason.
After a bit of investigation, the problem has been identified. The web site was serving its contact module with an SSL protocol under a subdomain.
The problem wasn’t the SSL Certiicate nor the subdomain; the webmaster was simply unaware that subdomains are treatead as different entities into the web analytics platform unless they are instructed to do the opposite.