It’s putting out 1,2, and 3 bladed leaves. In photoperiod plants, this is often from major stress or revegging. I don’t have experience with autos, but I don’t believe they CAN reveg. I do know that they can be sensitive to feeding and be finicky with other normal stresses - like transplanting. Your plant that is in full flower has the overfeed-burned-tips look. It’s possible that youre overfeeding and the other plant is more sensitive, and got shocked. It could also just be a bad/unstable pheno, in the genetic sense, and that could cause it to do weird things.