It's better to just copy the points and then paste them into the new layer. Because when you duplicate the layers the bones work differently.
Example: If you make a right arm and then duplicate that layer to use it for the left arm. When you do the bones the duplicated layer (the left arm) won't bend the right way. But if you copy and paste it will work
I don't know why this happens but it does. I'm glad i figured this out and i don't know if you guys already know about but i felt i should share this information.