Right now our fairly new (< 1yr) site keyword.com ranks #6 for "keyword". I noticed that a few of the other first page results were gone so I added the "&filter=0" query string to the URL to see if they might be getting a dupe content penalty. However, when we add that query string, our site completely disappears from the first ten pages of the rankings.
Is this a symptom of something? What would cause this behavior?
[first foray into somewhat competitive terms, sorry if this has been covered before]
