Error when Approved PO

is there anything that can help me?, here's what happened

1. I Submit PO

2. Reserved PO

3. Forward PO to a supervisor

4. Because of lack of approval limit, then the PO is forwarded again to a higher boss

5. After the PO Approved by the supervisor, I open the PO, Unreserved, and then I add attachments (short text)

6. after that I was approved back to my boss (approve - Forward)

7. PO is supposed to be forwarded to my boss but what happened is that the PO final status is Approved, and approved by the PO at me, not my boss

For your additional information, I do not have a limit for approved PO is because I was making the PO, and I am using Oracle R12.1.2