From what I've seen thats normal over growth. IMO just means the plants are happy and have an abundance of food to disperse throughout the cola region, with the right amount of light extra weird growth is achieved. I'm at week 6 with my green crack and she's an 8 week plant, shes had her general bud profile for a while now; but just recently in the past few days started spurting random new white hairs and more pistols in that specific area. They are randomly popping up in the middle of some of the colas, pretty late for new growth IMO. No matter what what you have just means more bud, so it's win win.