Minecraft Texture pack

I'm trying to make a texture pack for Minecraft, and when I completed the textures for Dirt, Grass side, grass side overlay, grass top, and grass side snow, and go into the game the grass top is fine, dirt is fine, but the grass side is just the default grass side with my over lay on top. No where in the texture pack is there the default one and no matter what I do its always the same. Why does this happen and how can I Fix it. Thanks.