A mismatch in the amounts between the HSN B2B and B2B sections can occur if any credit notes/sales returns have been created in the account.
If any credit note/sales return is created, the corresponding amount will be deducted from the HSN B2B section.
You can check the Credit Notes section and verify the details from your end. If you need any further assistance, you can reach out to the Swipe Support team using the link below.