Hello @Seller_NYbkGMb5h2gzd- and thank you for creating this discussion post.

For all products, Amazon deducts a percentage of the total sales price (including any delivery or gift wrap charges) as a referral fee. The referral fee percentage varies by category. Sellers also pay a variable closing fee for each media product sold.

You can see a breakdown of referral fees by category within the Selling on Amazon fee schedule.

You can also look into calculation methodology on this page, and you may be interested in reading through How to Read a Referral Fee Preview Report.

The 8% difference you are reporting may be due to referral fees, but you can always doublecheck with our seller support team directly as well!

I hope this information helps and thanks again for posting.

Best,

Danny