Adsense pageviews lower than analytics pageviews

My site - forum.allisonowners.com

I recently added the google analytics code to the site to track statistics, and at the same time I added adsense code to cover at least one ad per page - main forum, posts, profiles, etc - everywhere I have looked there are ads. Unfortunately Analytics is showing about 2x the number of pageviews vs what Adsense is reporting.

Any ideas why? I have seen these numbers reversed in other threads, which would be fine, but I feel as though I may be missing out on some revenue :)
 
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