Problem when posting links on Facebook

Posting links on Facebook using a Facebook Share Button or by copying and pasting the URL into the status button and hitting share is formatting strangely. While the link works and goes to the correct article, it no longer shows a thumbnail, article title or synopsis.

I am expecting shared posts to look like this.
Link to screenshot

But they look like this.
Link to screenshot

If I post links from other websites, they work and look just fine.

Any help is appreciated. I can’t figure out if it is something wrong with WordPress or Facebook. I’ve searched both help forums for answers.

My website is http://www.philipstown.info