Showing sex under 24 hour photoperiod

i have/had 6 plants under florecents under 24 hours of light when i realized my one had little nutsacks so i did some research and learned some males will show under 24/0 when i moved the plants into my big room with a 400w hps (still under 24hrs) 3 turned male and 2 female. why is this happening i dont need my 50 others flowering before they go outside please help:wall:
 
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