This is a major cause which can occur during the hotter summer months. As the material becomes warmer, it can expand, causing the floor to buckle, but don’t go making the room too cold either – in colder months, the opposite can occur and cause the floor to contract.
Buckling is most common in areas that get more direct sunlight, such as along sliding glass doors and large windows in the home. If the tile is self-stick or glue-down, the extreme heat from the sun can also release the bond of the glue, allowing tiles to shift.