I have a page with content hosted in an iFrame, both using the same GA account ID. When I look at the pages report, the parent page has about 9000 unique views, but the iFrame content only has 3700. Anyone have an idea what could cause that kind of discrepancy?

My only guess is that it would be caused by people moving on before the iFrame content has a chance to load, but the average time on page for the host page is 56 seconds, so that doesn't seem possible.

This is the page in question: http://cookware.lecreuset.com/cookware/content_le-creuset-lid_10151_-1_20002

The flipbook is hosted in the iFrame on a separate domain. I have each page of the flipbook triggering a virtual pageview to try to evaluate engagement with the book - when the flipbook loads, it fires a pageview for the page it is on, so that is the page I'm using for the 3700 number. I also looked at the source of the iFrame in the pages report, and that number just about matches the virtual pageviews so that piece is consistent.

Any ideas on this are much appreciated. Thanks!