Fix:
Replace the following function in the class
// returne the "default" post_id, not the revision [WITH BUGFIX BW H]
function get_correct_post_id($post_id){
$post_id_parent = get_post($post_id)->post_parent;
// Determines if its a post revision
if(wp_is_post_revision($post_id)){
$post_id = wp_is_post_revision($post_id);
}
return $post_id;
}