Flowering while in veg why .how do I fix it

I see the little pistil your referring to. I agree with the others, Plants show their sex before hand, it means they are mature and when you flip to flower they are good to go. Some people grow from 12/12, its does not mean the plant will flower immediately after sprouting because its on 12/12 the plant still needs to be mature like human hitting puberty. Nothing to worry about. Also if they are autos, then it mean they are entering flowering stage and you should prepare for the stretch that is to follow. Good Luck!