In the UPS include file, update the line:
$_SESSION[$UPS_eCart->CartName . "_UPS" . "_Quote"] = $WA_UPS_params["RATINGSERVICESELECTIONRESPONSE"]["RATEDSHIPMENT"]["TOTALCHARGES"]["MONETARYVALUE"];
to
$_SESSION[$UPS_eCart->CartName . "_UPS" . "_Quote"] = $WA_UPS_params["RATINGSERVICESELECTIONRESPONSE"]["RATEDSHIPMENT"]["NEGOTIATEDRATES"]["NETSUMMARYCHARGES"]["GRANDTOTAL"]["MONETARYVALUE"];