Have you experienced this? It happened to 5 of my sites so I do not think it's a glitch. I am doing tier one with web2.0 and tier2 with amr articles sites. I noticed it again and again. Google rank the web2.0 and even the article sites higher than my main site. 1, 2 or even 5 of these sites (articles and web2.0) are on the first page and second page for each keyword I target but not my main site. This result is becoming a constant for now for me. How to overcome it?