Hi Carol,
Sorry to hear about the problem. From your description, it might be a case of "tenting" caused by expanding tile pushing tight up against obstructions and having nowhere to go but to force themselves up off the floor. Look around the perimeter of the tile job to see if there is an air space or if the tiles (and/or grout) is tight to the walls or tight to the baseboard. There needs to be a gap around the tiles to allow movement. You may need to remove some molding to see this detail.
