You are using the C4D rendering engine. Unless you are bending a layer or extruding a text or shape layer, use the Classic 3D rendering engine. If you must use the C4D rendering engine, you have to offset the layers that do not share the same plane. The easiest way to do that is to move the back layer, the one rotated 180" in Y, one pixel farther away from the camera. That is not necessary when using the Classic 3D workspace, but it is still a good idea. The Classic 3D workspace also always renders faster and does not limit the 3D layers to no effects, no track mattes, and a few other things listed in the Info when you change rendering systems in Composition Settings.