Requisition approval notification should trigger to multiple cost center managers

I have configured multiple cost center managers for the same cost center on "Department" configuration page.

I have created Purchase requisition # 97 for the cost center "505000014401". 
As per Cost Center-Cost Center Manager configuration the approval notification should go to two cost center managers (ABREU, KATELYND and ROBINS, AMANDA).

When we submit the requisition for an approval, the notification goes to only one cost center manager (ABREU, KATELYND).

The notification suppose to go both cost center managers parallel for an approval.

Pictures are attached here for your review.

Picture A (Purchase Requisition Approval Rule)
Picture B (Cost Center-Cost Center Manager configuration at the Department page)