People say that all spiders wobble to some degree. I don't know if I agree with that, but a lot of spiders do wobble to a certian extent some time in their life. Some baby spiders will wobble, and then stop when they get older. Some baby spiders have no wobble, and then start when they get older. I wouldn't worry about the wobble in the spiders. If it bothers you though, buy one that doesn't have a wobble. Do keep in mind though that it may start down the road. It does not affect them in any other way though. They are among my best eaters / breeders, and they look amazing too.