Yellow nodes and stunted growth

Can anyone help me with what’s happening here? I have 2 out of 11 plants doing this, in compost about to be put into coco 60/40 pebble mix? New to growing but cannot find a plant with this problem anywhere?

Shall I put into coco?

Hi any pics, this will help also which lights, strain ,feed schedule as much info as possible, the more info the better help from ppl with experience on this site.

I have one lemon auto and one gelato x og Kush. All in soil for now until they go into coco. Lemon around 3 1/2 weeks in pot, gelato 2 1/2 in pots. No feed just ph water and small amounts of great white throughout. 10 gelato plants. 1 lemon auto which will be moving else where soon. 600w hps light. Two photos of healthy gelato in the same space and feed and one un healthy gelato. Also another photo of the lemon auto.