Why is my payment wrong on Facebook Marketplace?

As of the writing of this FAQ (Dec 2021) this has been a known issue across Facebook Commerce channels.  Please reference using the magic form to contact support.

Below is a response from the official Facebook Group.

It’s always advised to keep quality records of your sales. This will help you keep track of your items, money, customers, and taxes. If you want help on setting up a process, our youtube channel has a video on setting up a spreadsheet. You can also contact any of the admins for a consultation. *Please note, that consults may be paid. Each admin and expert will discuss their rates and options individually. 

How to Track your Numbers on a Spreadsheet with Facebook Marketplace

https://www.facebook.com/groups/marketplacesellerscommunity/posts/4473003166156065/

If you are not a member you can find a screenhere.