My dad has been growing since late December, he has had a few harvests now, all of unknown strains, and all random bag seed. We had one plant growing that looked really good, had lots of white hairs and even now the buds look really good. The problem is, when you give the bud a little squeeze, it has NO density to it. It just feels like the bud is packed with air, or kind of spongy if you will. Is this just a quality of the genetics, or what might be the problem with this plant??