We have recently added a free subdomain for SEO purposes. We are getting a high position in searches, but the problem is Google is not showing our main website in some of our keywords any more. I have read in blogs that there is no connection between domains and subdomains regarding SEO, but it seems to be wrong. Our main website (example.com) has a PR=5 and our subdomain (free.example.com) has a PR=3.
Can a subdomain interfere with the ranking of a root domain?
seo;google;domains;subdomain;ranking