models_attesa files cw & ccw are good on my side.
Loading the track directly from assetto corsa gives the same issue.
I've ruled out the possibility of a corrupted download, as I downloaded the track 3 times. each download was identical with the precedent.
I allow myself some random thoughts:
Like you said, your track is running fine on your computer. is there a possibility of something turned wrong in the zip upload process by RD?
Also, when I compare the files organisation between Attesa (not working) & AMP (working fine), there are differences, notely on models files and extension folders and files.
I believed there was a risk with AC and uppercase naming crossing lowercase naming (i.e: CCW , ccw)
At last, the title naming of the track is going from "Attesa" (main folder) to "Attesa - Podium Club CW" in ui file, to cw.kn5,
I don't know, maybe I'm all wrong on all these points. I'm no modder and it's just thoughts hoping to help the case.