Thowing off Facebook errors

Using the debugger at facebook: https://developers.facebook.com/tools/debug/, I get this message when this plugin is activated:
Your page has meta tags in the body instead of the head. This may be because your HTML was malformed and they fell lower in the parse tree.
Please fix this in order for the tags to be usable.

I’ve disabled other plugins and pinpointed it to yours. What is causing this, and how can it be fixed?

https://wordpress.org/plugins/aas-digg-digg-alternative/