I wouldn't worry, the light green top shows its begun growing...the edge of the very first leaf is touching the ground so id say it was moisture damaged as opposed to over feeding. Again this needs a lot of straight sunlight (can't do much about cloudy days) am wondering if you are in the northern hemisphere and it perhaps getting a little late in the season..maybe a bit cold at night? Hope that helps..it looks like its coming around. Sticky buds!