What caused these leaves to curl like this?

From looking at the weeks you posted and information you gave I would guess you are over watering. The time stamps on the pictures show the pots wet and only a few days apart. I noticed your growing in soil so my guess its mostly made up of peat moss, and peat moss can hold up to 20x more water than coco which takes it longer to dry. Growing in soil you need a dry period in the roots.