I am growing Carmelicious and wnat to know if anyone else has had this experience

I am growing Carmelicious from seeds obtained from Amsterdam seed company. I like that they charge you for ten seeds and send an additional 20 free. Anyways, my experience has been that you can accurately predict the males, as their leaves are thinner, the plants are more spindly, and they seem to auto flower regardless of the light cycle. I have had 6 out of 18 plants start growing male flowers even in a 20/4 light cycle. All have been skinny looking compared to the plants I assume will be female, and have started flowering at about 14 inches of growth. Is it just me? or has anyone else had this experience? Or is there something I'm doing/not doing that encourages these plants to flower out of cycle?