I'm wondering the same thing. I have never seen an adult male... or even anything further than a male preflower. Yet somehow I have a bunch of seeds forming on a plant. I'm really confused by this. The only thing I can think of is this: I did have some male plants that I pulled a few months ago... they only had preflowers. I set the containers they were in, along with the dirt inside, aside. I grew my females happily. 3 weeks ago I harvested two plants. I've dried and cured them... been smoking them for a little bit now and no seeds. A few days ago I pulled out some of the top layer of dirt, in the pots previously holding the males, to start some new seeds. As I scooped some dirt out, I noticed some of it float in the air. It was sucked up by the fan and blown onto one plant in particular. Well, today I go to check on my remaining (3) plants and I notice the plant under the fan has more than a few seeds... the other remaining two maybe have one or two seeds. I've read that it takes a 3-4 weeks for seeds to fully form... all of these seeds are white and small. So somehow in the last week I polintaed my girls... and the only way I can think of is the dirt laying underneath the preflowering males from 3 months ago.