Austin, just some questions to clarify what might be going on.

Are you absolutely sure these were young ASF's just coming into their breeding age?

When are you pulling the previous litters off to be weaned and raised as feeders or future breeders?

How hot is the room the ASF's are in? What kind and size of enclosure do you use for them? Do you provide a hiding area and a wheel?

Do your male ASF seem to be a good breeder (chasing the females a lot, physically ummm "suited" to his job in the colony ).

My understanding is that ASF's tend to breed more in the warmer months, less in the cooler months. Regular sized rats tend to be the exact opposite.