It's possible that your father observed something unexpected in your behavior or the way you handled a situation at a young age, which prompted him to seek medical advice. However given your own accounts, it seems like whatever concerns he noted might not be affecting you significantly now.
It might have been a passing phase or something you've outgrown, or might have been your father being overly concerned for you and seeing an issue where there was none. Perhaps discussing this with your father or a healthcare professional who has access to your medical history could provide more clarity.