If spills get down around the tile edges it may swell that chip board and pop tiles.I tried prying at one of the flat tiles after seeing the ones that fell off, but they seem stuck tight (for now anyway). I guess the adhesive needs gravity going for it - maybe good for that kind of strain but not a shear force like a tile on a wall trying to slump downwards. However, it's something I will keep checking periodically for the flat tiles even after the shavings go in.