Incorrect date shown when the PAYE liability is paid quarterly

If I have a company that makes the PAYE payment on a quarterly basis, when I calculate the salary it shows that the PAYE payment date is as if they make the payment on a monthly basis. For example if the PAYE for April isn't due until the 22nd July it still says it is due on the 22nd May. This is happening even though in the payroll settings it shows it is due on a quarterly basis.