Go to au_subgroups/lib/hooks.php. On lines 162 - 165 you will see the following: 

    if(in_array($filter, array("open", "closed", "alpha"))){
      au_subgroups_handle_openclosed_tabs();
      return true;
        }

Change to 

    if(in_array($filter, array("open", "closed", "alpha"))){
      au_subgroups_handle_openclosed_tabs();
      return false;
        }

That will (very likely) fix it for you!