I have the same exact problem. It works fine on desktop but iPhone shows same image as amontcoudiol indicated above.
Before I click on Facebook share on mobile:
http://www.21cpw.com/wp-content/uploads/2014/07/FacebookShareProb1.png
After I click on Facebook share on mobile:
http://www.21cpw.com/wp-content/uploads/2014/07/FacebookShareProb2.png
Thanks for any help!
Randy Z
