This is a common occurance.....usually it is do to a period of low air supply..did you try to bag your stuff too early maybe?Do you have a fan on it?I'll dry for about five days under a fan and then rewet by bagging the material for a night and then dry to finish(a few days)before doing anything with it.That's minimum.Often after I bag it for that night that odor occurs but soon after when it is dry and I bag it it goes away....no worries mate.