Clones leaves collapse inward

My clones were looking really healthy and growing a lot, but now the leaves are dark green, droppy, and the leaves fold downward making it look really skinny.

Can anyone tell me what the problem is? Is it overwatering?

sounds like either too much water or the temps are too high. When you water your plants you basically want to water them every few days as long as your clones have roots. you want to the soil to almost completely dry out before watering again.