Hi,
I've not seen that before, and just to make sure I'm understanding correctly I'll read back what I think I'm hearing:
Taking MOOSE-C3 as an example, your scenario is that you have 43 test cases added to MOOSE-C3, of which 1 test case has been started and has a status of In Progress. All other test cases in MOOSE-C3 have a status of Not Executed but are not counting towards total number of tests Not Executed in all your reports.
If that is the case I agree with your assessment: it's a bug, possibly some weird glitch when the project was created. I'd contact SmartBear support for help: SmartBear Support