Any ideas?

This guy was just an experiment, extra seed i had, green crack i believe, but he just had this deformity, my other plants are doing just great, i never planmed on him getting that far but its still interesting to learn
 
Thats what im saying, im under a 300w full spectrum led light, he was kept about 12"-18" from the light, i just dont understand because my other two are growing great right now, and this guy fully developed his first leaves before any new growth, like his leaves grew too quickly before the stem could catch up, is that stunting? Ive just never seen this.
 
Good thing im doing a couple strains, ill just toss this guy, the stem doesnt feel like a seedling, its hard and stiff like a more established plant, wierd.
 
Well im not seeing any new signs of growth, the cotyleons under it are starting to droop and get yellow, new growth isnt even lime green anymore, kinda sad really
 
That was right after i watered him, i just use a spary bottle and hit it until the soils a bit saturated. I do that once in the morning and once at night
 
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