I had the same problem here with Kalashnikova /20 seeds, 3 had this particular weirdo mutan thing 3 cotyledons, they all die at second or third week. with my 20 seeds i've save 2 mother plant who look healthy, when they both flowered, 1 was freaking weird, incredible big bud without any i mean any fucking thricome... i sold 1oz of this weed for 20$... and the other mama plant was excelent plant. a bit hard to clone (look like auto) but how good weed. I order 1 super bud to try nothing happend the seeds does'nt pop.. 3 cotyledon suppose to be rare 3/20 it's questionable in my umble book.
Do not keep it that's crap. trust me
I think Greenhouse Seeds had probs with their new genetics breeding maybe pollen leak or something. that's the reason why they sold them at ridiculous price... IMO i will stay far from greenhouse for the next ten year