Page is a not externally linkable
-- Google SEO News and Discussion
---- Google Updates and SERP Changes - July 2010
fred9989 - 10:26 am on Jul 19, 2010 (gmt 0)Thread source:: http://www.webmasterworld.com/google/4162876.htm
I agree with you and I think that is what has happened, however, the interesting thing is that the pages that turn up are not actually relevant to the original query.
Brought to you by WebmasterWorld: http://www.webmasterworld.com