I think it is pretty similar to the elstree prop
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quickly cut by hand (from a beer can?) , rivets not aligned , etc. Assuming the hero got much more "hanging time" it could be just wear, bending and deformation from the D-ring that make the clip look so asymmetrical.
I don’t think there would be deformation from wear and tear. As I’ve noted in the past, the prop sees very little action in the film. Unless the metal used was really thin and fragile (which sort of defeats the purpose of using it to begin with, in that case), I would presume that any wonkiness comes from how it was made, rather than on-set stress.