Requisition line status is in 'Pending approval' even after approval

For example, The requisition is created with 3 lines. Each line belongs to different cost center(charge Account).

We have setup the requisition approval based on Job level hierarchy in approval chain of cost center manager. So when I click on 'Manage Approval' in requisition page, it is displaying the cost center managers of 3 lines as approvers which is expected.

The issue is, In case if the line 1 manager provides approval then the line status is stuck in 'Pending Approval' only instead of 'Approved' status.

The same issue happening for line2 as well, The corresponding manager provides approval for line2, But the status is '