by using Select point I selected some points and Copy them ,then Paste , but the path isn't usual it hasn't width , when I choose select shape in the fill tools the path hide as you can see below
When you only copy some of those points, the shape is not copied. You have to copy ALL of the points that make up a shape to paste the points AND the shape.
In your example it appears that the stroke shape extends further up and contains more points then what you copied and pasted.