I've seen it happen to indicas if the heat is too high or they are suffering from light stress. I find going over 800 ppfd with LEDs start to stress them out. I think what they have is either a hermie or a male.foxtailing is where the flowers start produceing independant flower heads and start pokeing out all over the place. it usualy happens with a high sativa cointent plant or a pure sativa. just like in the pic. so its not thatView attachment 5266715