620 grams is normal for a juvenile/ sub adult ball python. 1500ish is normal for an adult male. Males wont normally grow as large as females, but that doesn't mean that they can't. I have a male that's 2200 grams. How old is your spider? People tend to feed their males less often then their females because big males make lazy breeders. But there is a difference between weight management and underfeeding. I would be very concerned about your 620gram male if he is an adult.
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