Differences between your quote and invoice may be due to a combination of changes in the quoted versus actual weights of the cargo, the addition of customs fees, and/or accessorial fees that may have incurred throughout the course of the shipment (this can also result in multiple invoices).
If you have additional questions about your invoice, please submit a ticket here so our Support team can help provide expert insight.
For a full run-down of potential additional charges that could incur throughout the life of a shipment, check out this comprehensive list.