I had a similar problem with topping some and not others. Solved it by tying the tall ones down. Now it's all nearly the same height. Lookin great tho. Goodluck the rest of the grow! Sub'dpeace bro i shouldnt of topped 1 now because my topped plant is now 2 foot and the rest of my plants r 4 feet so the topped plant has been swallowed and not gettin any light so am gonna do 1 plant 1 day with a 600w,top it then let it veg for a good month or 2