Auto-Flower Basics Guide

Hey man, I think something is wrong with my lowryder. Its super short. What's its problem?

Its on a 20/4 light cycle, 100w cfl, orchid grow nuts, decent soil ph balanced and its about 21 days old. maybe more. Why is it so short?? and should I be sexing it or switching to flower nutes? here are pics?DSC06748.jpgDSC06749.jpgDSC06750.jpg
 
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