GetCallCount unexpected results

I am getting unexpected results with GetCallCount. From the documentation I was assuming that GetCallCount would apply to a single mock instance but my results are showing that it applies to all instances of a mock. I have two tests that create the same type of mock. If I call GetCallCount in the second test, the call count will include the calls made in the first test.

Is this by design?

I have a sample that reproduces the problem if you need it.