After I cured my leaves I put them in plastic bags for storage and now they have a strange smell, kind of sour, not sure how to describe it. I have multiple varieties and they all had pleasant and different fragrances to them, and now they all smell the same. The characteristic aroma of the variety comes back when smoking to some extent but the unpleasant smell is still there. It is not mold (stored bone dry). Is it ammonia? Not sure what that's supposed to smell like. Or could it be related to the plastic bags?