Discrepancy in tax pcb

Hi,

This is related to tax PCB deducted from the salary - from payroll.my salary calculator, with RM5000 monthly salary with no bonus (employee epf is 8% and spouse working with 2 children), it shows the tax payable is RM135.00.
However, from the payroll processing every month in the system, the employee was taxed at RM168.35 (since January 2017).

May I understand how this happen? From the employee management page, it was already declared that this person is married (spouse is working), and having 2 children. EPF rate is 8% for employee.

My admin highlighted this earlier as she was checking the tax table from LHDN. The person shouldn't be taxed at RM168.35.