SU bandwidth monitor with 5830 AP

We have a new monitor software and I am trying to graph the traffic from each SU on a 5830 AP. I found the oid but is not giving me the right data is graphing a straight line then I walk the mib an got same answer so I guess I need to do some kind of fuction, math?

Or how do I do this?

The oid I am using are :

1.3.6.1.4.1.5454.1.20.3.6.1.22 - suRfInOctets

1.3.6.1.4.1.5454.1.20.3.6.1.23 - suRfOutOctets

Thank you