It sounds like you are saying that the water rises 1.25" higher on the liner -- closer to the bead -- on one corner, than the other. Is that correct?
If so, on a liner pool, having the pool cocked by 1.25" over the length of the pool is not necessarily a functional defect, so long as you are using skimmers, and so long as there are no water level features that depend on the pool being exactly level.
On the other hand, in my limited experience with liner pools, a 1/4" end-to-end variation in pool level was the standard on the pools I worked on. I have much more experience with commercial gutter pools, where the standard is 1/16" total variation in level from any point of the pool, to any other point, regardless of size. (Gutters and other rim flow features depend on EXACTLY level edges for proper function.).
However, on liner pool, the ultimate level tends to be set by the placement of the wall segments in concrete, and is thus rather hard to change.
I think you need to look at your contract. If there's no specification of maximum out-of-level allowed, it may be hard to force him to do anything.
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