The Shipping Doubled

orders:

id	cust	shipping
1	A	10
2	B	20

order_items:

order_id	qty	price
1	1	100
1	2	50
2	1	30

SELECT o.cust,
       sum(o.shipping)        AS shipping,
       sum(i.qty * i.price)   AS goods
FROM orders o
JOIN order_items i ON i.order_id = o.id
GROUP BY o.cust;

What are the two rows?