My initial guess would be that there are hits coming in that are page events. You should use the metric occurrences to look at all hits. It would be a sum of page views and page events (which are link calls s.tl() calls like a custom link or exit link etc. )
We are seeing something similar...and I wondered if it was because I was specifying page name and URL on both page load and link click events. Is this not best practice?
Also...even if it is because its counting page views AND page events...surely a unique visitor has to load a page to interact with an element on that page (and therefore page views should still be higher?)