Credit bureaus aggregate the credit information delivered by various banks and NBFCs periodically (usually monthly basis) and record them in an individual’s credit report. This report has a comprehensive history of your loan and credit card repayment transactions, account usage and outstanding balances. It acts as a foundation for the calculation of the credit score.
It is likely that the data deliberating on your credit report is not precise or not up to date. The bank or NBFC may have missed sharing all updates related to your transaction with the credit bureau. Even if the bank or NBFC has reported data appropriately, the credit information firm may have missed updating or is yet to update it in your credit report. Such faults or slips on your credit reports can lesser your credit score.