Selling amount more than actually made

[eyeofthetriad]

Hi, the amount of money that I’ve sold vs what eBay thinks is off by at least $8. It’s showing I’ve made more money then I have received. Why is this? 

[soh.maryl]

Are you not taking into account the costs to a seller to sell on eBay, like the final value fee which is calculated on the total amount paid the seller by the buyer, that is, item cost plus shipping plus state sales tax, if applicable?