PO approval

Good  Morning,

We are using R12. 

For purchase  order standard approval - we are using position hierarchy

For approval limit we  defined  for GM 100000 USD  and for CEO no limit

So for all ok ,

• If any PO value < 100000 - GM will be the final approver.
• If any PO  value > 100000 it will go to CEO  for approval.

that is the expected behavior

but what happens is that when PO value < 100000 it still forwarded to CEO after GM approve

i need help to solve this issue