i agree, sounds like a bit of mold or mildew. Ive had that happen to portions of my crop if they dont air often during the curing process. set it aside for future hash or extraction. PS: if theres mold on it, chances are you bought "fresh" weed (a.k.a you got ripped off) scale it out in a few days and it will weigh like 75% of what it did when you paid