PO Approvals

Using E1 9.1 tools 9.2.0.5???

Approval routing as follows:

20000     User A

50000     User B

200000     User C

PO processing options:

Awaiting approval status = 250

Approval status=280

User A enters a PO for $20500, it is given the status of 250,250.

My question is, why does the PO go to waiting for approval status when User A has authority up $50000?

If need any more background, please ask.

Thank you