Hyper-V Hypervisor Virtual Processor\\% Guest Run Time occasionally has bad values

Question

I'm accessing PerfMon data via RegQueryValueExW () calls in a C++ program to collect a variety of metrics. I've noticed that
Hyper-V Hypervisor Virtual Processor\\% Guest Run Time occasionally contains incorrect values, as shown both in my collected code as well as in PerfMon. (Also % Total Run Time, and possibly all the metrics.)
My test environment is running 2008 r2 standard, service pack 1, on an Intel Zeon CPU (if it's relevant), and is hosting four guests, none very active (_total = .449, the rest = .030, .513, .185, .194, .341).
The problem is that occasionally the first, least active, guest will spike well above 100% (as an example, 6300%).
When walking through my code, the issue seems to coincide with the order of the subscripts being returned from RegQueryValueExW () changing, where the first, least active subscript moving to the second location, and getting an unexpected value. When it returns
to the first spot in the series on a subsequent call it once again has an expected value. Oddly enough the new "first array element" has the expected value even after the shift.
Actual returned values for a 30 second collection cycle, values are shifted by 1000:
GuestRunTime[hyper-vtest_0]; current = 1211813.198, previously = 1211804.192
GuestRunTime[win2k3EntR2_-_prometheus_3]; current = 18401087.260, previously = 18400964.194
(interval)
GuestRunTime[hyper-vtest_0]; current = 1211822.625, previously = 1211813.198
GuestRunTime[win2k3EntR2_-_prometheus_3]; current = 18401201.918, previously = 18401087.260
(interval, and then the array order changes)
GuestRunTime[win2k3EntR2_-_prometheus_3]; current = 18401327.210, previously = 18401201.918
GuestRunTime[hyper-vtest_0]; current = 601735.139, previously = 1211822.625
(interval, and then the array order changes back)
GuestRunTime[hyper-vtest_0]; current = 1211841.390, previously = 601735.139
GuestRunTime[win2k3EntR2_-_prometheus_3]; current = 18401472.446, previously = 18401327.210
(interval)
GuestRunTime[hyper-vtest_0]; current = 1211850.605, previously = 1211841.390
GuestRunTime[win2k3EntR2_-_prometheus_3]; current = 18401577.243, previously = 18401472.446
As you can see, the value supplied when the array shifts is rather wonky, but returns to an expected value after the array shifts back: 1211813.198 -> 1211822.625 -> 601735.139 (?) -> 1211841.390 -> 1211850.605.

Answer 1

Thanks Deepak for your response.
1) Firewall is turned off
2) Below is the output from R3trans -d command:
C:\Windows\system32>r3trans -d
This is r3trans version 6.24 (release 741 - 04.02.14 - 20:14:02 ).
unicode enabled version
2EETW169 no connect possible: "DBMS = SYBASE --- "
r3trans finished (0012).
3) The latest dbsl patch that I see on SMP is indeed 35 (Our Kernel is 7.41 64-bit Unicode)