The more you mess with your seeds, shock the plants when you transfer, and "hassle" your plants, the better the odds you'll have stunted plants (so developing), and/or they'll become males.

Female plants develop when the plant thinks it's in a safe place where it's worth dropping some seeds. Male plants develop in places that are rough and screwed up, because it doesn't think it can sustain life all that well, and hopefully it will just seed a female, create real seeds, and so goes the process.

Be gentle with your plants.