Weird texture in bge When I press P to play my game, my mesh transforms to ugly textures, but when I just view in the viewport the mesh is perfect.

It does not come from normals or from GLSL.

Here is a GIF of my problem
Problem.gif

The gif is big (40mb), wait for it to load before viewing.
I guess you have semi-transparency enabled. Turn it off.

Other than that you might have a mirror modifier active or mirrored the mesh somehow.