Hi, and welcome to the forum!!
Pool construction is NOT my area of knowledge, but there are some very knowledgeable members in that area, and I'm sure one of them will be along soon to give you some insight into the cracking concrete and stairs.
As far as the wrinkles in the liner, they could be due to the pH getting too low for too long, but more likely they are related to the water leaking from the cracking steps. When water gets behind the liner and pushes it around, it starts wrinkling like crazy--I got a chance to witness that first hand this past winter--we had a tear in the liner and another unidentified leak, so I let the pool drain itself over the winter, and the liner pretty much started wrinkling everywhere, and the more water that drained, the worse they got until it finally just floated almost all the way up.
So--if you can fix the cracks in the steps and put a new liner in, then the wrinkling should stop. I don't know how much it will cost to do that--I had a new liner installed a month ago, and paid $2500 for the job--average costs here (in Louisiana) are $2500-$3500 just for the liner install.
Janet
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