TSR Integration->Classes & Payroll->Only three classes get assigned to employee, fourth class is not getting assigned.

1] Login to the application as a partner.
2] Click on "Assign Classes & Payroll" tile.
3] Check checkbox infront of any employee.
4] Select classes all the four classes from dropdowns.
5] Click on "Apply" button.

Actual Result:
Only three classes get assigned to employee fourth one is not getting assigned.
Expected Result:
All the classes should be get assigned to employee.
Refer attached screenshot for more details.

Cc: Saurabh Sablaka, Swapnil Pandhare, Prasad Pise, Mahendra Mungase, Rajendra Joshi, Niteen Surwase, Komal Barde