Wall height difference...

[CliffTex]

We just got through filling up our 16x26x52 pool and was concerned about the depth differences against the walls. During the filling process we were monitoring the water level and found one side seemed to either be dropping or the other side raising. After the pool was full, there was about a 2 inch difference in depth on one straight wall vs the other. There are no buckles in the wall nor bulges in the sides. During the ground preparation our difference was only about 1/2"-3/4" at worst. Our pool has the external buttresses and again it looks very stable but it is just high on one side. Our base material was decomposed granite on a mostly rocky terrain. We only have about 2" of topsoil which was removed and replaced with the granite.

Should we be worried?