'Compare' takes me to all posts view

Hello,

Clicking ‘compare’ in either the ‘Forks’ WP_List_table for any fork, or clicking ‘compare’ while editing a single fork both take me to: http://site.com/wp-admin/edit.php and displays all my blog posts. I tried forking a ‘post’ and a custom post type, both displays the same behavior.

If I hover my mouse over the ‘compare’ link to shows a url like the following:
http://site.com/wp-admin/revision.php?action=diff&left=57373&right=63895

I’ve disabled all plugins and reverted to using the twentythirteen theme, made no difference.

http://wordpress.org/plugins/post-forking/