I'm trying to store my charcoal in a tall stack like i do my peat and my firewood, but it keeps collapsing to the sides a good 3/4 of the time? And I thought I was doing something wrong with where i aimed for placing it, but just picking the layers up that fell and trying again and again it finally placed a piece in the exact spot i'd been trying for ages, so...I don't think I was doing anything wrong? Why won't it stack properly? I know there's a bit of gravity mechanics, but it seems weird that the peat and firewood stack just fine?