I have the same problem with GChrome !
I visited your website and i was impress by the move effect on the pages like if they moved upsidedown. I figured it out, but it's a reallyyyy good trick ! Well done !
Anyway so if you have a solution, i d like it plzz
Last thing, google does not index all your content. Because of js loading, obviously. But I have a trick :
You have your mainNav as <ul><li>, and inside spans that trigger the page change. Just put a link instead of a span and put the url in the href.
Then do exactly the same with jquery (bind click) AND rewritte the href of your link and put '#' everywhere.
Google doesn't execute js so it will see the href and will be able to follow the "links".
Hope it'll help !