snmp values changed in 11.6?

i just upgraded some ltms from 11.4 to 11.6 and noticed my snmp throughput numbers are considerably different, i'm wondering what changed? is there a different mib that i should be querying?

 

i double-checked all switch ports and the traffic remains consistent there however the f5s think otherwise.

 

i'm using sysStatClientBytesIn and sysStatClientBytesOut