lower back rounding bottom of squat

why does this happen?
i do a low bar squat, and my lower back tends to arch a bit at the bottom.
what should i do from keeping this from happening?

btw, my mobility is not the issue for hammies/glutes.
 
If your gluts/hammies aren't too tight (as you say they're not), then I would suspect that either your erector spinae and core muscles need conditioning, or it's simply a faulty movement pattern that needs correcting.
 
thanks, i fixed it. it was a quick fix made by raising the sternum and allowing the knees to drift slightly over the toes.
 
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