Planes clipping through each other.

Hello! I am currently making a game which includes a background make of planes with a texture on them. When I put one plane in front of another, sometimes the back plane will seem to clip through the front plane, except the planes are at different z positions. When I change the plane's material's rendering mode to opaque, the problem is fixed, but since I am using a texture with gradients and alpha, the texture becomes visible where it should be invisible. The only rendering mode that fixes this is fade, but that produces the problem i'm having. If you have anything on this please tell me.

Thanks!

(If you need any clarifications or a video please tell me as well ;])