Some phenos turn purple some don't. i have had the same thing in an indoor tent. same seeds same strain just 2 different phenos, one stayed nice and green the other 2 turned purple. bad thing was the 2 that turned purple were much less powerfull as the high went. the green one was fire.
i have 2 plants i checked last night mostly milky tricombes, with just a couple amber. a couple others with mostly clear and a few milky, the rest all clear. i am going to harvest the first 2 and buy a couple of those canopies and try and ride it out.