Not enough light and the lights are too far from the top of the plants. You probably started them much too early. They look to be about the right size to plant outside in the March 21 picture.

Yup. Next time, either start them all at the same time, or raise up the little pots so that the plants are all at the same height, then put the lights very close to the leaves. Not knowing where you live (and when you can plant them outside), I could suggest that the super tall ones that you plant them lying down so that only the top leaves stick up. If planting out is a long way off, I would cut those very tall ones to above the first set of leaves, then cut the tops to about 6" and root them in water (or soil). Then you will have more sturdy plants to put in the garden when the time comes.

Thanks Im in Zone 6a. I decided to just start over yesterday and plant them all out around May 20. I was really surprised they were getting enough light. I had an issue with some of the leaves getting too hot because I am using fluorescent lights. I was wondering if it could've been the fertilizer I used as my other plants are doing just fine. But I do agree. I started them much too soon!