Overtime Counting Formula is not working in this Sheet

I am beginner to MS Excel but i try to correct this file Formulas. I have an attendance sheet for our Company Employees.
This attendance sheet shows the salary of the month from the total basic salary / hour and overtime / hour of each
employee.

I found a problem in this sheet. When i reduced overtime charges in the last of this sheet so the Total Salary of the month
was not changing. I couldn't found any mistake in formulas.

please help me in this matter !!!!