Well. You can see that the three first post titles are links, and you can click them to go to that post. OK.
In the forth post, yo pass th mouse trough the title, and the hand don’t appears and you can’t click it. You can click the image (if it has it) or in the counter of comments, but in the title not.
If you make right click in the title and inspect the element, you will see that firefox shows the h3 of nav-below.
Thus, the nav-below is too tall, and overlaps the content of the post.