What are the potential reasons for a pool rising (decking sinking?) ?

TDTPool

Gold Supporter
Aug 13, 2022
100
Cartersville, Georgia
Pool Size
6000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Hayward Aqua Rite (T-15)
We're in the middle of discussing renovating our current pool, but as the price rises I'm wondering if perhaps I could instead enhance the pool, and just focus on outdoor living - However, there is an issue since I re-opened the pool where either the ground on one side if sinking, or the pool is rising.
At this point some of the surrounding stone has cracked, I can see ~1" rise, and the skimmer cap is about 2" higher than the stone, and I know it wasn't before.
I am noticing it is on one side more than the other. I haven't noticed any water loss, and I've turned off the 'waterfall' in case it's pressure build-up. We haven't gotten a lot of rain in the past few months, so I'm curious what else it might be?

I know the builder is going to push me to do a complete re-build; and honestly it's probably the thing I do. But I'm wondering if there is something I can check to see if I can just "upgrade" this pool (Remove liner, fix foundation, etc etc) to reduce cost, or think I'd still end up near the cost of a new one anyway?
 
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