IDR application processed?

Hey everybody, I just recently graduated this spring with my masters degree and ~250k in federal loans being serviced by aidvantage. Back in September I submitted an IDR application (one day I was randomly able to submit when all the other days the application button had been greyed out)

On studentaid.gov under my applications, it says all steps have been completed for the IDR application, including “application processed. Your loan servicer has completed review of your application”, dated 10/28. This means I should be in the IDR repayment plan right??

Per my aidvantage upcoming payment I owe 1700 dollars which corresponds to the standard repayment plan. I had been waiting to see if this number would go down to ~850 which is what IBR would be. I will be calling them on Monday.

My question for everyone: how is it possible that my application was processed by the servicer but that is not reflected in my upcoming payment? Is this legal?