Teen Parents‘ Genetics Messed Up

Hi everyone!

i don’t know if it’s a bug from a Mod or bc of the last update but I had my teen give birth to a boy recently and at first he looked fine (darker skin tone, just like the father). Then, suddenly he turned extremely pale and neither sim is that light. When I went into CAS and aged him up, he looked NOTHING like either of them and had the lightest blond hair and weird eyes… 

Does anyone else have an issue with this? 
thank you!!