Transparency problem with overlapping geometry

Hi, guys.
I try to make transparent curtains with translucent blend mode material. As it visible on pics, the material don’t khow how to behave where several geometry layers are placed in a row, one over another. In some places it becomes dark, in others too light. It depends on object’s grid. The same thing in material editor, thus I think the phenomenon is caused by material and there are no problems with curtain geometry. Something have to be changed in material settings, but I don’t know what. Can you help me, colleagues?

You can read this old article: Striving For Real Time Photo Realism There’s an explanation of how to create transparent material for curtain.

And here’s the result:

That helped, thanks.