Eastern_Rosella

I'm new to owning a pool so hoping someone on here can help. I had our pool put in over a year ago while our house was built. We've only been swimming in it for the last month or so and I've noticed the bottom is bulging upwards. It's in the middle towards the shallower end of the pool. There is a hydrostatic valve at the deep end of the pool but the floor seems fine down that end. What can I do? Thanks