We offer free shipping on orders over £50.
Have a BOGOF (Buy X Get Y) coupon running on an item worth £15.
Customer bought 2 products - subtotal £30.
Coupon added 2 additional items making a subtotal £60. (correct)
Then discount of £30 brings the subtotal to £30 again.
However, when the customer is checking out, they are getting free shipping based on the £60 total.
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