fix code error

biz-hd/custom/classes/CustomClass.php

@@ -1033,7 +1033,7 @@ class CustomClass extends BaseClass
                     if (!empty($hd)) {
                         $hd->member = $memberData['level'];
                         $hd->memberName = $memberData['name'];
-                        $hd->discount = $newDiscount;
+                        $hd->discount = $c->discount;
                         $hd->save();
                     }
                 }