Why can I see transactions from previous months in my unmatched tab?

You have the ability to submit a bank rec before every transaction has been matched. The transactions that haven’t been matched will appear in later bank recs. This means if something was matched last month then it will appear on the current month.

It is recommended that users do their bank reconciliations when every transaction, within the month they’re reconciling, has been posted. If users back date transactions after the reconciliation is done, then their Trial Balance /Balance Sheet and Closing balance per cash book will not match.