Im finally almost done with my pool renovation I just had a new vinyl liner installed in my pool. The problem I'm having is the liner is not flush against my walls in the four corners of the pool I've been told that over time with sun and temperature chane that it will stretch into place. I believe they are 6 inch corners and they said its almost impossible to get the liner flush against the corners. And also there is a wrinkle in the shallow end corner. Is this acceptable from a pool company being that I paid them to install the liner. Any help would be greatly appreciated thanks.