SC doesn't go back to approver again after changed by requester

Hello Experts,

We are implementing SRM 5.5 with N step Item base approval (WS14500015) process for SC.

SC created by requester goes to approver for approval. Approver Changes the price in SC & Approves SC. This SC comes back to Requester again. Requester goes into his inbox, change SC price back to origional & Save again.

Now Ideally SC should go back to approval again however in our case SC is getting approved straight a way & PO is getting created in SRM ( Ex-classic Scenario)

Wondering why SC doesn't goe back to approver again for approval?

Any help is highly appreciated..

Thnaks & regards,

Chris