Wrinkly leaves

Hello, so the wrinkles started with the 3rd set of leaves and is continuing with the new growth. Any ideas of what's happening and how to fix?

First grow, mystery seed...

Also, can I tell the sex of the plant from the new growth growing between the main stalk and stem?

See attached pics

what size pots are they in? what are your temps do you got heat issues? hows air circulation ?

and you cant tell sex until 12/12 male will be a little stem and circular balls females will be more teardrop looking with a white pistil coming out of it