What gameplay feature is this bug affecting?
10 Year Breeding Event

What's the issue? Please include any error messages you receive and as much detail as possible.
Stud baby litters aren't counting towards the 10th Anniversary Breeding Challenge.

Any links relating to this bug? For example, if a particular lion is bugging, what is the link to that lion?
Nah

Any screenshots you can provide us with?
Nah

Please provide us with step by step explanation how this bug happened so we can attempt to replicate it. If it's complex, please include screenshots where possible:
Stud baby litters are born and I only have 1 out of 10 litters (One is from my own lioness)