It's not a problem. It's your own fault. Apparently, you didn't texture the top part right so it wouldn't warp/shrink at the top. If you knew the correct format, this wouldn't happen.
You can fix it by doing a 128x128 and throwing it onto there, then uploading the 128x128 version, its just that the measurements are exactly correct so it fills it with close colours.
You view textures by either buying the texture itself or the other way but I cant rememebr the other way.