Weird Page switch for a keyword in Google Rankings

[inhouseninja]

Over this past weekend Google switched the page which usually showed in search results for keyword benchmarking. It went from from http://www.apqc.org/benchmarking to http://www.apqc.org/benchmarking-portal/osb. Also on Google the Rankings for the keyword 'benchmarking' sank from 15 to 47 for http://www.apqc.org/benchmarking

Just looking for some theories or ideas or anyone that has had this happen to them.

[DennisSeymour]

This does happen. Did any of your competitors also shuffle at that time?

As long as you aren't doing anything wrong then it should be ok. You might want to look at your internal linking and links pointing to both pages that makes Google think that that page is more relevant. You could focus a little bit more on the page you want. It should return soon.

Ive experienced this before about 8 times this year already. The good page always comes back.