Pic is view looking down from above. Only owned pool for about 18 months and had a hole rip by the main drain over the winter that they couldn't fix. Bought new liner and had it professionally installed. All looked good for a couple days as we filled the pool and then this lump started forming. I had the company that installed the liner out and the guy said "it feels like some of the wall foam is just bunching up behind the liner and I shouldn't worry about it". We didn't have any kind of lumps in the old liner nor did I see any areas when they removed the old liner.
The bump feels really jagged to me. There are smaller bumps lower on the wall as well along the same plane.
Is this normal? Can it be fixed after the pool has been filled? Any suggestions on how to approach with the people who did the install?
Thanks a bunch.