Weird seedlings? Is it normal

I grow in coco. So what it means when a plant starts and is deformed. In most cases it means the feed us too string too soon. In your case I believe this is true. Going by the darker green in leaves. I run a 5.8 ph In and 5.8 ph out in run off. Coco needs to always stay wet. Seedlings don't need nutrition till day 7 from sprout. Plus Coco needs a cal mag supplement. Coco grows are very ph sensitive.