>>/34773/
Other sites leave their content in the cache (they are there so the page loads faster next time, your browser doesn't need to fetch all the parts of the pages over the internet, also for cookies, session following and such).
From your screenshots it seems there's 8 MB of stuff that doesn't go anywhere, even after emptying the cache. As you see here:  >>/34607/ on the second pic, I got 0 bytes after clearing it.