Went to my stash of Vit 3n37 and picked up 2 4lb. Jugs. One felt heavier than the other. Put on a scale one weighed approximately 4 1/2 lb. other weighed 6 1/2 lb. BOTH containers were factory sealed, different lot numbers. Unscrewed both containers and both smelled the same, very little odor. Tapped both containers to try to level out powder then looked inside one had more powder. Put a piece of pvc to measure level and one had approximately 50% more powder. Never heard of this, both were kept inside of house, not garage or basement ? ? Anyone ever heard of this? Factory error? Thanks