Thanks for the updates and the pics!
Oval pools are harder to 'overlap' than round. With an oval, you need to be sure it's sitting ~ perfectly centered along the long wall axis - otherwise one side will slip more than the other.
The slip from pushing the liner to the wall is less tan pulling it down to reach the floor and cove. However, as you've noticed, the 'tile line' will warp. No one but you will notice the warping, as long as the liner stays overlapped, I'd let it be.
I didn't fully realize how the liner was secured before I saw the pics otherwise, I'd have suggested a different way to secure an overlap liner while it's filling.
I'm hoping that you get the pool filled with no more issues and can soon start enjoying it!
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