We purchased a used 2011 Heartland Edge two years ago and have had no problems until recently when we noticed dark "blotches" appearing on the floor tile - seemingly from underneath. I have looked through these threads to see if anyone has had similar problems but can find nothing. Has anyone had something similar happen? These are splotches that have come up in the bathroom mainly but also in the kitchen area. We thought the glue might be bleeding up. It does not leave residue on socks or on cloth used to wipe up the floor.