Fetch and render tool - full webpage not crawled?

Hi guys, a simple question: I used the fetch and render feature on Google Webmaster tools and when I saw the rendered page, it was only two thirds of the page.

Background info:

- This happened for an individual post and the home page. The individual post is stickied and shown completely (not paginated/no "read more" link) on the home page.

- The post is what most people go to my website to visit. It's a big, 3,700-word "top resources" post. It's something like "Best Free Joomla Resources Every Webmaster Should Know About" or "Top Ten Nicolas Cage Movies Ranked." Meaning, it's a top list that is quite long but very useful. It features over 20 different items/resources which all have pictures, text and external+internal links.

- Fetch and Render tool said "partial" but when I checked the only thing it said was blocked was one one ad I had. No other info given.

- However, when I looked at what the render tool of the page looked like, it was exactly like a screenshot of my page but it stops two-thirds down.

So the question is, does the render tool just work that way? Is it supposed to show the entire (very long) page or is it normal for it to stop somewhere?

Most importantly, does this mean the googlebot is only crawling the first two-thirds of the homepage?

The other pages/posts on my website are indexed and I have not seen any errors or other crawl issues.