Leaves cupping inwards

https://www.growweedeasy.com/curling-or-clawing-cannabis-leaves Check out this link on over watering and root problems,, looks like you overwatered causing leaves to look fat and droop also resulting in root problems eventually... You might have a slight nitrogen toxicity with the clawing,, but theres no tip burn or burnt edges which rules out it being too close to the light or a severe N toxicity... Imo you're safe on both those fronts unless the heat generated from your lights raised the overall temp in your room along with over watering resulting in a root problem which is where I think you're at... Check out that link they've got pictures looking very similar to yours Best of luck mate!!