Kerbal Space Program

This bug makes crafts fall through the terrain as if there was no ground, and then when the command module hits the terrain, the whole craft explodes as if it had crashed, and sometimes the craft explodes over above where the terrain is. It happens when attempting to land on a moon. I have seen it on the mun and minmus, but i haven't seen it an any other planet or moon. Usually, when the lander is coming in to land, if it is around 800m above he ground, debris will be seen to hit the ground hard and explode, which is normal. Then anywhere from 2km (the highest i have been above the ground when I see it) to 300m above the ground a "warning sign" appears, which is in the form of a line of no texture of the body, you can see right through it. That is a good way to tell that the craft will sink through the terrain. The next sign of the fact that you will fall through the terrain is that the scatter is not there. After the command pod hits the ground the flight events message pops up and it says in my latest case "kerbal 1 crashed into --minmus". Also it only happens on certain parts of the planet. On the mun, it is where ever you try to land first, and on minmus, it is pretty much everywhere but the midlands. The only way I have been able to achieve it with a lander, NOT debris is going at a velocity of under 20 m/s, sadly that includes landing velocity. But if you are going higher the craft crashes into the terrain as normal. Also, on minmus, if you go to the space center while the craft is landed on the midlands, and come back, you will have no control of the craft, and it will be stuck there (unless you use hyper edit to send it back to kerbin somehow) forever.