I did some investigating, and found that if you lay it down initially, it's fine and level. It's if they try to lift and replace the board in the same spot, then it creases like this. Wondering if they did that many times over and that's why it's lifting.
Update: The installer is trying to contact them to see if it's a manufacturing issue, or an installer problem. They'll be sending an inspector over after the holidays. Since it's 25%+ of the floor after my inspections, I'd bet money that it was an installer issue!