[Plugin: WP Facebook Open Graph protocol] Thumbnail not showing but the image is there

Hi,

The plugin is working fine, but I’m having issues with the thumbnails. In Facebook Debugger, the first image on the post don’t show in thumbnail, but when I click on it, it opens in another tab, in full size. And the “default image” always appears.

So, when I share the post on Facebook, the only image I got is the default.

Link to Debugger: https://developers.facebook.com/tools/debug/og/object?q=http%3A%2F%2Fblogdoedu.com%2F2012%2F10%2F04%2Fchirp%2F

http://wordpress.org/extend/plugins/wp-facebook-open-graph-protocol/