That's what I was thinking. Husbandry is correct and I always feed at night. Never had this problem before but never tried to feed either of my ball pythons something so small. Since i've had him he's eaten three adult mice and even a small rat at 70 grams, he looked like a blimp. He always strikes/constricts immediately until the small rat since he was intimidated by the size but still ate it and hasn't eaten in about a month now.