Why do my baking sheets twist in the oven?

My wife and I recently moved into a new place. Ever since we have moved, we have noticed the oddest thing: when we put things into the oven on baking sheets, the sheets end up twisting. As they cool, they go back to their standard shape. We’ve used these same sheets in other ovens without any problem.

Is there something wrong with the oven? Should I get it checked out? Or should I just learn to live with it because it isn’t a big deal.