New liner in IG pool

Upon opening, I discovered that my liner, installed new last year, had come apart from the pool wall in 3 places. It's under warranty. I dropped the water level and somebody will be here tomorrow. But this never happened in 18 years and one other replacement. I'm already freaked out about next year's opening (sorry, OCD). What about the water that got under the lining? What is Liner Lock and why wasn't it used in the first place?
 
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