Jest issues while running tests without flag --runInBand - my test fails

I'm having some problems with my node tests with jest. When I write the command to run the tests without the --runInBand flag, some of my tests fail. And when I try to run with the --runInBand flag they all pass...

It's always a good option to use the --runInBand flag? Or I did something wrong? (I'm working with some async tests...)