'More' link appears randomly

In my website I have a ‘Recent posts’ feature which enables me to view a couple of posts in a page of my selection. BUT it seems as though only part of the posts show the “[…]” link, although all of them has “more” defined.

Here it is:
http://therabbilist.com/mshefer.com/%D7%94%D7%95%D7%A8%D7%99%D7%9D-%D7%9E%D7%A1%D7%9B%D7%9E%D7%99%D7%9D/