Am wondering if this is a bug or what.

I have tried to mate the same two villagers and they both started out with no parenting skills. I checked both parenting skills, put them close to the Love Shack, they kiss, go in come back out. Both of these are now adept parents. And as you can see by the population, they haven't had any babies yet.

Vanau is 26 and Varua is 27, so I know they aren't too old or two young. Both are master scientists and have no other skills but the adept parenting.