Buckling Pool walls

[amaahs]

I just recently installed a 12x24 above ground pool. I filled with water 4 days ago and I'm noticing very small buckling in the bottom close to the wall rails between the side buttress'. The buckling is about 2 to 3 per section and is quite small. My worry is will it get worse to the point the walls would collapse. Does it just take time for it to settle? The round sections are fine and show no signs of bucking. I thought I had leveled it out pretty good but perhaps the ground there was too soft or not level enough.