I recently had a contractor install a new vinyl liner in my pool. It's been about a week and we were able to get into the pool for the first time and we noticed that virtually the entire way around the pool, at the intersection of the wall and floor, the liner is not pushed flat against the wall and floor. That is, there is an angled area where the liner spans from 6" above the bottom of the wall out to the floor about 6" from the corner. It seems that the liner may be too small for the pool - is that the cause? What can the installer do about this - new liner? Thanks.