Tried the new update all the head shapes are working but one. i took a screenshot of the head shape I'm talking about in the appearance menu if that helps
So say may character has head shape 1 like in the screenshot all characters that are birthed from the character with head shape 1 will never have head shape 1 but can have head shape 2 3 4.
I changed the code, now depending on the combinations of the head shapes of the parents, the children will have the same if they are the same, the combination (long head + small head = medium head) or in low probability a random head.