The Net Pay generated by the system is wrong

Hii ,

i have an issue for payslip.

The Net Pay generated by the system for an employee for the month of Oct.09 is wrong. When i analyse the payslip, the difference between the Gross Earnings and the Deductions is different from the actual Net pay.

Please help , i have checked in form . In earnings column total is calculated correctly and deductions also but there is excess amount in net pay.