I have 3/4 of a fifty pound bag of Dumor grower/finisher and today it looks moldy. How can that be? We have kept it stored in our house and clothes-pinned the top shut after getting out what we need to feed the chickens daily. We have had it nine weeks-I am off to buy new feed right now. I removed from the coop what I gave them this morning. Has this happened to anyone else? Doesn't seem right.