$search_string = '';
     if ( $num_rows > 1 && @$_REQUEST['output'] != "pdf") {
          if ( $num_rows > 5 ) { // simplified logic
                $search_string = $mm_action_url."index.php?option=com_virtuemart&category_id=$category_id&page=$modulename.browse";
 
...
 
                        /* start mod cherrypicker */
                        $chp_low_price=vmGet($_REQUEST, "low-price", "");
                        $chp_high_price=vmGet($_REQUEST, "high-price", "");
                        if(!empty($chp_low_price) || !empty($chp_high_price)){
                            $search_string.="&low-price=".$chp_low_price."&high-price=".$chp_high_price;
                        }
                        /* end mod cherrypicker */
          }
                echo $search_string;// URL GOOD
          $search_string=$sess->url($search_string);
                echo $search_string;// URL NOT GOOD
 
 
          $tpl->set( 'VM_BROWSE_ORDERBY_FIELDS', $VM_BROWSE_ORDERBY_FIELDS);