It's not unusual for cats to stash their kittens in multiple locations to reduce the risk of losing all of them to a predator. Occasionally they'll forget where they left them or simple encounter another issue and not come back to the kittens for days.
I rescued a kitten once I was sure would not make it and a few days later saw a female cat sniffing around the area. I assume it was probably the mom coming back for the kitten but figured it had a good home now so let her wander off.
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