So, here's the difference that I found. If you're coming from Google SERPs (the referrer is Google) the answer is shown near the bottom. If you copy and paste the link into a browser (empty referrer) I get the results you show in your screenshot.
That screenshot was most definitely taken with Google as the HTTP referer. (I'm too lazy to cut-and-paste the URL from the search page into the browser, I just clicked the link.)
Clicking the link again shows the additional content at the bottom of the page as you described. So there's some other algorithm at play.
