Is there something I can do to prevent this from occurring again?

Hey,

I hope everyone is doing well. Quick question, A customer purchased an item today that I had to ship today as well.

However, they are not required to pay extra for shipping even though I have expedited shipping and same day handing (customer pays extra for shipping) setup on my template.

Why did the customer not have to pay extra shipping?

I ended up taking a loss on this sale.

Is it because he got a coupon?