disposition dublicate dispo issue

@@ -783,7 +783,7 @@ class CampaignController extends Controller {
 					$subDisposition = $dispositionEntity->sub_disposition;
 					$subDisposition = $dispositionEntity->sub_disposition;
 
 
 					if(!empty($mvalue)){ 
 					if(!empty($mvalue)){ 
-						$mvalue .= $mvalue."~$code|$disposition|$subDisposition";
+						$mvalue = $mvalue."~$code|$disposition|$subDisposition";
 					}else{
 					}else{
 						$mvalue = "$code|$disposition|$subDisposition";
 						$mvalue = "$code|$disposition|$subDisposition";
 					}
 					}