Some of my models appear to be broken with their rigs and mesh when I import them, but this is not a problem inside the modelling program.
The model in Sketchfab:
The model in Blender, where it was originally made:
Is there a fix to this?
Also this occurs with some of my humanoid models with rigs as well, where the animation previewed in Sketchfab often bends the limbs in mysterious ways, especially the hands.