I have Shopify shipping by weight enabled, the product has a weight, and is configured with the correct box. In checkout, Shopify correctly calculates the shipping price when only ONE of the item is in the cart - $21.95.
If I add two to the cart, the shipping suddenly becomes LESS, at $16.90. WHY! A customer made an order and this happened, in the order details it shows that Shopify has the weight correct (image below), why is it calculating the shipping wrong?
