fix discount calculating

src/features/order/orderSlice.ts

@@ -650,7 +650,11 @@ export const selectGrandTotal = (state: RootState) => {
       ? Number(state.order.restaurant?.delivery_fees) || 0
       : 0;
 
-  return subtotal + taxAmount - loyaltyDiscount + deliveryFee;
-};
+      return (
+        subtotal +
+        taxAmount -
+        (state.order.useLoyaltyPoints ? loyaltyDiscount : 0) +
+        deliveryFee
+      );};
 
 export default orderSlice.reducer;