39 days into flower.... whats wrong?

Either too much H2O or Not enough!

Usually when leaves claw like that it means too much water. I would say its probably a combination of overwatering and maybe a root rot problem. You might try repotting them but its kind of late in the flowering to do that. It might be worth a try though. I imagine they will hermie on you.

Also go get some ferts like fox farm or advanced for the new plants. MG just don't have what a cannabis plant really needs