I don't know exactly what is going on..someone will be around to tell you more but I'm guessing it's because of the fertilizer!! I NEVER fertilize at that stage. There's enough nutrients in the soil that will do the
plants fine until they mature more. My
plants are about a foot tall now and I still haven't fertilized. I try my best to keep the temps around 65F and am constantly circulating fresh air from the outdoors. I'll feed them with a 10-52-10 when I
plant them outside but that will be it unless it's needed.
Like I said, someone will be here before too long and tell you more.
Christina