trying to install 18'X33' oval deep end above ground pool, pool came with straps installer said he could convert pool to deep end pool. installed to point of putting water in on the expandible liner and as water lever came up to the return level one side of pool wall shifted 5 to 6 inches toward deck. Water was drained and concrete and rebar were put in to hold the buttresses and allowed to set. Water again was put in pool and as it reached the return level again that wall shifted. Any Suggestions What do we do now. The other side of pool was dug out so those buttreses are up against a dirt 3 ft dirt wall.