Guys what would you think if your child doesn't look like you but it is yours?

What would think in this scenario:

Your kid looks absolutely nothing like you. You already took both DNA and paternity test but both tests matches and the result is positive. You are the father even though the kid is different from you.

What would you think in that case? This happened to someone my friend's older brother. The boy looks nothing like him but both exams still shows matches his DNA and the paternity said 99.99 positive.

Updates
2 mo
Before the tests, he really thought it can't be his child but the exams showed otherwise. He has no clue how his kid has different features from him. Him and his kid are literally like water and oil.
Guys what would you think if your child doesn't look like you but it is yours?
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