My guess is that's from lack of humidity that the buds provide... Its not there when you have 2-3 nuggs as opposed to a whole jar full.. Or half jar. We always leave room for the buds to "breathe". We never pack the jars clear full... My wife is a master at curing/burping. She truly has it down to a science lol
So my long winded point... Lol its not the Integra packs its less bud in the jars... As to why the humidity went down.