I have no experience with ASFs, but plenty of other rodents, & every now & then one female gets "possessive" & tries to steal babies but isn't nursing them. You need to remove the offending female if you want to save the litter. Not all females co-hab peacefully & help each other- many do, but there's always some exceptions. But again, I'm mostly talking about rats & mice, & you mentioned mice- I know ASFs are quite different so please go by those posting answers who raise them specifically.
FYI, I don't give wheels to breeding rodents either. They appear to get addicted to running, at the peril of offspring still trying to nurse. Just saying. And for productivity, mice do best as 1:2 (one male, 2 compatible females). More females (3+) = less reproduction, usually, or more chaos over the pinks.
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