how much nutes are you using? i over nuted one of my girls and the difference was horrendous, the plants with the correct nute ratio are lush , whereas the over nuted plant of the same genetics, is half the size, tryin to find my pics to show you the difference....
the light green plant in the center, and then later it is yellow, you cna see a definate difference between the one over nuted plant and the rest of the tent.
hope this helps, but you need to post a pic with your question, as without that anything anyone tells you is just a guess. since we cant see the plant to diagnose the problem