Line up Panels?

I model this two surface in Rhino with Networksrf command,and the isocurve looks line up with each other,then I subdivide the surface to get some sub panels,but they didn't line up,could anybody explain and know how to solve it?In my imagination,these two surface share the same edge,so the isocurve should line up(it is in Rhino)and also the sub panels should line up along the shared edge(but it's not like that in grasshopper)...