When importing a bank statement, sometimes there are duplicate lines which pull through due to timing. We'd suggest to wait for the following day to pull the statement to ensure the correct transactions are loaded.
In the event you need to delete a bank statement with reconciled amounts, we'd suggest to
go to the bank statement and click on the blue button 'Unreconcile' only. DO NOT select Unreconcile and Reverse as this will cause paid invoices to revert back to unpaid.
Once all amounts on the bank statement have been unreconciled, a button on the top-right 'Delete Statement' will be shown and you may click this to delete the bank statement: