Scrambled textures and planes in rendering.

Hey guys, can you help me? I created several loose faces on the same object that share the same texture (a texture that has no background), only when I render the textures on top of each other in a disorganized way. And this happens in blender render, as in Cycles and bge.

Already tried in edit mode to press Ctrl N, but does not solve.

THX, you guys are top!