Two Change orders are getting created for single modification / edit on a Purchase Order

1. I clicked on edit on PO and modified the description and submitted for approval
2. The PO is approved
3. The status on Change order 1 changed to "Pending buyer action"
4. Buyer submitted it
5. Now a new change order 2 is created and submitted for approval.
6. Once approved, this completed the change order process.

This is working in the same way when either the requester or buyer initiates the change order. Please advise if this is the standard oracle process or is there a way to bypass "Pending Buyer action".

Please advise.