fix

netflix-service/src/main/java/com/cyksj/service/order/impl/OrderDonServiceImpl.java

@@ -3263,7 +3263,7 @@ public class OrderDonServiceImpl extends ServiceImpl<OrderDonMapper, OrderDon> i
 				if (userUpgradePackageId != 0) {
 					UpgradePackage hasUpgradePackage = upgradePackageMapper.selectById(userUpgradePackageId);
 					BigDecimal thisPackagePrice = hasUpgradePackage.getPrice();
-					differPrice = thisPackagePrice.subtract(upgradePackage.getPrice());
+					differPrice = upgradePackage.getPrice().subtract(thisPackagePrice);
 				}
 
 				if (differPrice.compareTo(BigDecimal.ZERO) < 0) {