Facebook Open Graph Warnings "og:url"

I’ve been working the last few days with the Facebook plugin trying to connect my blog posts to my Facebook Fanpage. I’ve configured a Facebook app to the best of my ability but there still seems to be some issues. The posts do make it to the Fanpage from the blog about half the time. I was running lint and it keeps kicking up

“Inferred Property: The ‘og:url’ property should be explicitly provided, even if a value can be inferred from other tags.“

But according to the Object Properties the information is there and listed. I have no clue how to correct this.

http://wordpress.org/extend/plugins/facebook/