User is trying to bill out some expenses on a project, but the charge amount is incorrect due to unusual markups showing against the expenses.
This can happen if you previously billed the expense entries on an invoice and adjusted the Net Bill for the invoice by changing the Billable Expenses amount on the Create Batch Invoice screen. Core adjusts the Net Bill by adjusting the markup on the expenses in this case. Check out this article for details on expenses automatically being marked up. However, if you reverse the invoice, the changes to the markups are not reversed. So when you try to bill the expenses again, the adjusted markups still show up against them. To fix this, you can select the expense entries and batch update their markups to the value you want. Check Core Help for details on batch updating expense entries.