That page is working for me. I'm attaching images below of the share dialog showing it and of the actual post that is made:
Auto-posting uses the same Open Graph tags and should look identical to the above. If not, let me know. My best guess is that Facebook hadn't updated the cache for your page when you first checked. If you create a post and then immediately share it to Facebook, then Facebook may not have scanned and processed the page fully before putting it into your feed. Usually, even if the picture doesn't immediately show, it will automatically update in your feed once the page has been processed. That shouldn't take too long (usually on the order of tens of minutes), but we've seen it take hours before.
Auto-posting is great, but one thing you may want to do is:
* Create the article
* Scan with the Facebook URL debugger to make sure it has the right information before you post
* Post
I hope that helps, but if you need anything else or aren't seeing the same behavior, just let me know.
Thanks,
Alex