I downloaded a sky grid map. I started to build a house. One block leftover on the floor was a red stone ore. Later when I finally got a furnace I tried to place it on the redstone ore but it instantly got Destroyed! I placed it and nothing happened except it disappeared from my inventory. I checked my chest to see if the cobblestone was there and it had just glitches but it wasn't. I checked on top of the redstone ore but nothing was there. It had disappeared completely.