Qt Creator is mixing definitions, slots etc. when multiple projects open

Qt Creator is mixing member funcs in two projects. E.g. if you follow a slot in SampleA project, Qt Creator will show the definition in SampleB project. If you add a new slot in SampleA and choose refactoring, add definition Qt Creator want's to add it in SampleB (!!!, in the wrong Project)

I made a PDF with all steps and pictures, this bug is very bad (!!).