Step 1: Check if pool is placed on uneven ground:

Make sure the pool is setup on level ground surface so the pressure from the water is equal throughout the pool liner.

Step 2: Check that the pool is full:

The pool will need to be filled to 80% capacity.

Step 3: Check for over exposure to sunlight:

Over exposure to sunlight can cause the top ring on fast set pools to expand and become deformed. The fast set pools should not be placed in direct sunlight, unfortunately this is not covered by manufacturers warranty.