Looking to the result for the u-offset I found a black.white map. Indeed I thought that it's not only black and white in the numerical sence.

So pushed a clamp node between ... the preview of the math nodes looks similar but as I thought there is only a tiny part really white=1.

So after clamp the pattern material stretches over the complete white area.

B.t.w. I have used the same pattern like you. Only I colored some cord's with blue and red for the crossing and green for that outside. It's only the have better view on the small render preview window.