How do I know the program I created has a false positive result in it?

What program? What is it testing? more details and context are necessary.

P.S. Creating a new account because you got off on the wrong foot, is against our rules.

Test it. You should know where it should pass and where it should fail. Test where it should pass and where it should fail as well as the boundaries. If there is a case where you get a false positive you should know. This can be done on a class by class and method by method basis.