manufacturers often don't know what tehy are saying and in this case numerous local environmental variables at play that greaty vary from one garden to the next... always rely on plant observation to tweak those suggestions.
so, are the nodes too tightly spaced at top? doesn't look like it in pictures, so i doubt this is caused by intensity of light. Though you can assess this better in person than through a pictures... intial node growth is always tight but does space out.. if it remains too tight, that's caused y too much light.. if it stretches too much, that's too little light... easy to see and react to this. take notes when you find the distance and hours of use per day that result in proper growth.. it'll be similar the next time but maya vary depending on how much your environment changes. (temp, rh%, co2 levels, primarily)
did you spray anything on the plants? this can cause odd pistil coloration
Are there any nanners or sacs in the room? if you have a hermie in the room, pollination can cause early coloration of pistils. these little bits can really hide.. inspect entire plants.
maybe bit high in concentration... leaf curl is typically a sign of a bit too much, but that is unlikely behind the pistil oddity.