I had that issue with every ball of my shine sport. Some balls only had a couple knots. BAD ones tho. One ball was so knotty I just tossed that aside hoping I won't need it.
I haven't had the worsted yet, but I find that the sport balls are so loose and small, and the band that goes around it barely stays on it's so loose. So after some movement and use the whole ball tends to just fall apart. I don't have a ball winder so I am stuck.