This is a common problem that comes up in both bathrooms and main floors. Tiles can pop up, buckle or lift in a tent shape. As your home ages, the foundation can move, expand or shift. Tiles are going to move and shift with the foundations of the house, and this can cause enough pressure for the tiles to pop up. Making sure that your tiles have room for expansion and movement when installing is the best way to avoid this. A quality tiler will always do this, but it can’t hurt to discuss it with them before your project starts. If you have this problem now, we suggest contacting a quality tiler to inspect your floor and give you options to fix it.