Strange texture stretching - big mesh

Hello !

I’m currently having some trouble on some surfaces of my model (a big environment), as you can see on the screnshot below :

Here is a wireframe view, which makes the problem even less understandable :

Please note that in Blender and 3dsmax, the texture draws normally, nothing such as this appears. The UVs don’t seem to have any problem when I check from the fbx used in unity.

The texture is a RGBA TGA image, and the alpha channel is used as a specular map.

Has anybody seen that problem yet ?

Thanks by advance,

Dmitri

check texture for tiling in import settings - should be Repeat, not Clamp