Hello Faisal,
The ST03N statics are updated by the standard job SAP_COLLECTOR_FOR_PERFMONITOR. You might check if the job is running properly and scheduled hourly.
By The way, have you checked for dumps in ST22 in the backend related to the RFC user?- We're currently having such issue and a lot of errors in the change log performance have been reported. We trying by implementing a new SAP note related to performance.
Have you checked SLG1 after the synch? the message is that the log collection ended succesfully or not?
Cheers,
Diego.