How common is it if your "nationality by heart" is not your actual nationality?

I have never heard of this quiz, I imagine it is designed for fun and not meant to be fact. These quizzes often have crazy results. I take quizzes to find the perfect dog breed for me and they always suggest a breed of dog I would never own. It was just a quiz, it was just for fun, be who you were meant to be and don't change your life because of a quiz.