i solve this problem!
my model needs to "reset x-form" in 3ds max before export

On my model, some of the vertical planes of the border appear light, although they should be shaded. Conversely, those vertical surfaces that are illuminated by the sun appear dark. It's like the normals are flipped, but only for lighting system. Please, help. Could it be the wrong shader setting? Or is it the model itself?!!