Stop U- and V- directions of a surface from changing

Hello everyone!

I made a specific surface that can be adjusted using several parameters. In a later stadium I divided the surface. To do this the block divides the surface along its U and V direction (in variable amounts). 

The problem is, when I move the sliders the U and V direction keep changing and the block does not do what I would expect. 

I found a post from user djordje where he talks about an analysis tool that visualises the directions:
http://www.grasshopper3d.com/profiles/blogs/reverse-and-swap-u-and-...
This tool is included in my file and needs ghpython to run.

So to conclude: is there a way to fix the U and the V direction of a surface?

Thanks in advance!