Perhaps at first there was a large surge of new visitors, for whom the majority quickly browsed your site (i.e. few page views).
As time went on, your visitor count decreased as fewer kept returning, but the large majority of these 'dedicated' viewers increased their browsing time on your site (increased page view pp), in effect balancing the page-view count.
Ok, sounds a bit far-fetched now - I'll just shut-up
