problem of texture rendering in wld files

[sandy]

[img]www.projecteq.net/files/sandy/karnorbug.jpg[/img]

as you see i'm trying to render the karnor zone, but i have an issue i really don't understand, some polygons don't care the uv coords taken in the wld and render with tiny textures like on the screenshot !

did i miss a value in the wld files that controls that ?

I divide all u and v i take from files by 256.0f and all the polygons I process seems to have good mapping values and render well

so why does some polygons render so tiny ???

any idea ?