Hey 420Strainhunter, at first glance, I’d guess it’s either over- or underwatering.
I have a few questions to help narrow down the cause: What’s the pot size? How often and how much do you water? What medium are you using—Coco, LightMix, or Living Soil? What nutrients are you using and what’s your feeding schedule? Or could it be the genetics—what strain is it?
The more info you provide, the easier it’ll be to find the cause.
Good luck with the rest of your grow!