I’m wondering if there’s a mesh that’s popping through it from within? Maybe take the mesh into 3DS Max max / blender and carefully inspect the model, make sure there are no vertices directly on top of each other and delete them.
There’s a second mesh shining through, I think. Set material to additive with the wire frame on, then the object is transparent - maybe you can use the Move tool with a very small radius to align the points individually again…or delete the other Mesh…