How to edit spline point created by bluepoint in editor?

I use spline and spline mesh to create a long road.
In construction input a length it can create lots of point then i want to edit each point in the editor map.
At first each point can’t edit ,so i add a node ‘input spline point to construction script’
Now I can edit the point, But when i move the location of the point, it seem like i copy so many point?