I paid the amount indicated in the invoice but e-kyla shows a debt?

The due date of payment of invoices has been indicated separately on each invoice. The due date of payment of monthly invoices is the 24th date. If an invoice is paid after the due date, also an invoice for the fine for delay will be added, bearing the date of reception of the payment on the current account of the Student Village. The invoice for the fine for delay will be covered from the same payment, the rent will remain due for the same amount and the calculation of the fine for delay will continue on the basis of the same amount.