We had a Keystone Litehouse and our floor looked the way you described. We had a couple water leaks and the backing on the flooring used absorbed some of the water. When it dried it looked terrible, like big stains everywhere. I ended up covering it with carpet to hide the stains. I cut the flooring in the stained area to look for mold but it was just discoloration from the backing. I'd keep an eye on it to see if the color changes to a darker stain. Good luck.