I think there are a few variables which you need to be aware of and possibly correct if proving detrimental. First off you should state the the strain as maturation periods vary greatly and are geneticlly pre-determined. If it is a sativa strain then it is not uncommon to have longer maturation period which might explain the expression of your plants. If it is a short maturing strain then you need to look into other variables that are proving detrimental.

One thing to check is obviously if your getting proper requirements met. If so then you need to look into whether you darnkess is being interupted. One short episode of interuption is not detrimental, but a constant, repetitive interuption is problematic and causes stress to the plant. Theoretically this can/tends to induce hermaphrodism. Basically these aformentioned variables cover the gammet as to why your plants are at the stage that they are. Any other info would be helpful.