Seller being charged more then buyer shipping

[minikrumz]

So I am selling cards on here. I have it set to usps first class mail letter and it says I pay $0.66 then after item is purchased I am charged $4 for usps ground service and I cannot change if

[eastlaneave]

You will want to select eBay Standard Envelope as your shipping choice, not First Class or Ground Advantage.

Your listings, at least the ones I looked at, say "Standard Shipping (USPS First Class Letter )"

You want them to say eBay Standard Envelope as the shipping method, if you want to use eBay Standard Envelope.

You can mail in a Plain White Envelope with stamps, but you won't have any tracking or insurance

When you print your label try a size of 6x4x1 and see if you can print an eBay Standard Envelope.

Revise your current listing and select eBay Standard Envelope as the shipping method to prevent future problems.