If you live in a windy area the wind may have buckled it if your door is not rated for the area. It is very windy here and our door is double sided and really heavy to take the wind. In our last home I bought a HD door and the wind blew it in since it was not wind rated.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT