Could it be that your liner has stretched in the deep end, thats what happened to ours, to make sure, measure from the top of the water to the deck in the deep end and and compare that to shallow end measurement. If they are the same then your pool is level. It may just be the weight of the water in the deep end has stretched your liner so it looks like its more underwater than the shallow end. You can also measure the border of the liner Shallow vs. deeper to see it the pattern has stretched.
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