September / December 2015 exam

For September / December 2015 exam, for Question 5b) stating the following deficiency " Overtime reports which detail the amount of overtime worked are sent out quarterly by the payroll department to production supervisors for review. These reports are reviewed after the payments have been made which could result in unauthorized overtime or amounts being paid incorrectly and Bronze’s payroll cost increasing." I don't understand the second sentence, how do they know that these reports are reviewed after the payments have been made? Could you explain sir .