WMI query for Counter of type RateOfCountsPerSecond32 shows raw value instead of persecond value

Question

I have created some custom performance counters form my application to record TotalRequest (numberOfItems32) received and Request received per second (rateOfCountsPerSecond32). These 2 counters works fine and displays proper values in the perfmon. However when i use WMI query from logstash plugin the request received per second counter show the raw value instead of the per second value.

1. Can someone explain why WMI is not getting the per second value?
2. Is this a WMI limitation?
3. Is there any workaround to get the per second value from WMI query?

Thanks