Hi everyone, just a question to put out. i finished install on my 15x30 54 inch pool steel wall. I installed a 1 inch extruded foam board 4x8 sheets taped at the seems as the base. Its pretty good except for the dirt showing up at the seam areas when it settles to the bottom. After three weeks, i noticed a wrinkle spot about a foot long not far from the wedding cake steps and on the side near the return and skimmer. It looks like a slight wrinkle blister and when i walk on this area, the liner appears loose on the bottom in that one spot only. Not sure if this is stretching or something else underneath in between the liner and foam board like air or water pocket. We havent had any rain since before install and fill and the ground has been really dry. Any thoughts would be appreciated.