Fender stops without accident

We found out that in our Seat Cupra the fender on the passenger side is warped. The passenger door can no longer be opened,because otherwise sheet metal is pressed on sheet metal. We had no accident and no one can have driven us in, because the paint is undamaged. We ask ourselves whether it is a material defect or if someone else has damaged our car. What is surprising is that there is no damage except that there is suddenly a gap there. We would like to know if there is someone who might know the problem?