Ponds render weirdly if fog is at at any level (when its set to 0 they will just render in a very brown color at high distances.) the higher the fog level the weirder they will render. If you are at a close distance (1 to 10m) they will appear almost normal, but with some weird colors in them. As you get further and further, the pond's color will change from a whole spectrum, from brown to blue to an ultra bright white. The only way to see the pond properly is getting very close to them in a no fog environement.