They appear to be foxtailing. Any number of factors could cause or contribute to this. I have had this happen when too much nitrogen was present during flower or a stretch of hot weather hit in flower. I wouldn't worry too much about it.
Every year I get one or two plants that seem to stress flower or auto... They usually end up as an 8" - 10" tall bud. This year these two ended up as about 1-3oz total.
Here is a bud from one of them.
I get "krinkle leaf" in my first sets of leaves on a couple of the plants I grow every year but that is genetic and they grow out of it. I have no idea what that is.
I think your suspicion that a it's a soil condition might be the first place to look. I wish I could be more help.
x3
Drop the seeds into a damp medium about 1cm deep and wait. Do not over water, do not cover the medium with a cover that will create a humid or hot environment, if outdoor do not put them in direct sunlight.
They can go out now, the sooner the better. I recommend putting them out in a spot that has full shade (or where they only get direct light at dawn/dusk) for a week or so as they will need to get used to the intensity of natural light. This process is called "hardening off". You will likely see...
I am with you, CANNABIS...
Marijuana, marihuana, weeding, pot, etc I feel are all slangs that perpetuate the demonization of the plant.
In other news, yes it's a girl.
Let them dry out a little then squeeze the pots around the sides. If you can't squeeze then give it some taps around the sides. Place your Palm against the soil at the base of the stalk and turn the pot upside down while supporting the stalk and the soil mass. Tap the sides of the pot again and...
I would actually be a little concerned with moisture collection under the foil that sits on the soil as a potential breeding ground for mould. Other than that *thumbs up*