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Dr. Pete just posted an article that might help explain what's going on here - http://moz.com/blog/comparing-ranktracking-methods-browser-vs-crawler-vs-webmaster-tools Moz uses a crawler to track the rankings you see in your reports. Because of personalization and a variety of other factors, the results in the report might be slightly different than what you see when manually searching in your browser.

Open your campaign, click the "On-page" link beneath the name of your campaign and chose your page from the list of keywords/URL beneath the On Page Optimization Reports.  The  the "Page Analysis Detail" on the next page shows you the important factors for the page.