Invoices on the customer page are rounded to the nearest whole number; this is how they are downloaded in Excel. The total at the top uses the exact values of all the invoices, so may have a slightly different total.
Why don't the invoices on the Customer page add up to the total at the top of the Customer page for a report?
Learn how to troubleshoot discrepancies between individual invoices and the total displayed on the Customer page for reports.