Could you provide a specific URL that you're seeing this problem for? I ran the Facebook Open Graph Debugger on the site you've recently run Autotune for, and it indicated that Facebook is having a hard time reaching your page. The following error occurred for me when I re-scraped the information for that homepage.
If this is the page you're seeing the behavior for, then follow the suggestions in our Common Support Questions for "My Share Preview is Incorrect":
www.sourcecoast.com/jfbconnect/docs/common-support-questions/
If this is not the URL/site you're experiencing the problem for, please let me know.
-Melissa