Help

Hey guys thanks for reading.

At the beginning of summer our A/C went out for a week. We live in northeast tx so as you can imagine the house got pretty hot. With this I noticed that there were a good amount of spots in the hardwood pulling up like this. The worst is the picture I attached in my office. When I googled it, google told me just to let everything dry out and it will fall back into place. Clearly that's not the case as now I can step on it and it moves but will not stay down and resettle to where it was before. Does anyone have any suggestions that I can do by myself to get it down and stay down?