Second Veg growth

I have six plants in a hydro system under a 400 watt HID light. Everything has been beautiful throughout their whole growth process. The plants are 65 days old. All buds except the colas are near ready for picking. All the colas but one have begun to grow as if in a second vegatative growth. They are extremely large now but I am afraid they will not get ripe. I decided to start a pre-harvest flush a few days ago, and still they just get new leaf growth everyday. I pinch the tops when I see them getting taller. I am afraid I will have to harvest the whole plant with out the colas reaching their prime. The lower buds are stinky, sticky only days away from harvest. Any help to what is my problem?