Looking at views per active user and session, it appears that users tend to need to re-view some pages when they are navigating content on the site. While that is perfectly fine, the amount of unique views per session is slightly more than half that of total views per session, meaning that users could need to be backtracking quite a bit in order to access unique content.
There could be potential solutions in creating a more comprehensive navigation, or having options to enable such a navigation. Offering significantly more content in the navigation from the get-go might overwhelm new users too much, but providing the option to deep dive through the navigation for experienced users would allow them to drill down to exactly where they need to while using the site.