v2.10.0.4

I've set up a new trivial project with some tests.
In my vstudio NCrunch tells me I have 64 tests via "Monitoring 64 tests, with no tests ignored".
When I start console tool on teamcity in a clean workspace , I get 75 tests.
When I start console tool on teamcity in a non-clean workspace (i.e. same as above but not cleaned), I get 71 tests.

Some observations:
* The AllResults.html from the 2 scenarios with 71 resp. 75 tests have 0,09% difference in code coverage where the cleaned execution with 75 tests has less code coverage, where 1 line is not covered. I can't tell which line since the build log from the 2 cleaned vs non-cleaned test runs are indicating all tests within that particular file are run.
* If I do plain "text copy" in tab "Test results" for the 2 cleaned vs non-cleaned test results I see no orphan tests in either one.

Any clues what is going on?

(I use 3 grid nodes)

Thanks.