Surface Isotrim on a revolution surface returns non-identical surfaces

Hi everyone, I have a quick question.

I'm using the Isotrim component to divide a revolution surface in 22 radial surfaces. I'm doing the usual thing, namely using divide domain2 and then dividing the surface. It is doing the work, but the different surfaces have different dimensions, and that's something I would've not expected with a revolution surface (which is supposed to have radial symmetry right?).

Info about the surface:

1 - The revolution surface's profile is a straight line joined to an arc (I'm getting a surface, not a BREP as a result of the revolution operation)

2 - The axis of the revolution is offset in relation to the curve (So I'm getting a void in the middle of the surface, like a ring)

3 - The surface I'm isotrimming is an offset of the original surface (I don't know if that has any relevance)

4 - The surface is being reparametrized in the Isotrim and divide domain components. 

I've attached an image explaining my problem, and the rhino and GH files. Any help is much appreciated!

Thanks!

pd: In the image, the orange lines represent the surface subdivision, which is what is giving me problems.