[ARCHIVED] Sims give birth to clones - Genetics don't mix

I have the same problem. I have experimented in different saves and the problem persists. Children are born either clones of their parents or of each other. Previously, I had children who mixed the traits of their parents. The presets always changed a little. Now they are the same. This is very sad, because I play Dynasty and want to see how genetics change from generation to generation. In the first picture there are three brothers, they are not twins. The second picture is of a father and son. I don't want to play exactly the same sims in every generation