I think that you've deleted your model (could you confirm this maybe?) so it'll be harder for us to provide a meaningful answer so I'll just add some details to https://help.sketchfab.com/hc/en-us/articles/203064088-Re-upload-a-Model:
When you reupload a model, some settings, like camera and orientation, are not checked at all; we simply re-apply the previous settings as we assume they must be correct from the "expected" usage of the reupload feature.
However, if you scaled your scene, this will probably look completely wrong.
Regarding materials, we compare the previous "definition" of a material with the new one; if they fully match, we reapply the settings defined in the editor, otherwise, we use the new (reuploaded) one. The matching is based on material names. If you change your material name, we'll not reapply your previous material.
To still give you some latitude, we do not compare textures by names but by a pixel signature. Thus if you simply rename a texture, we should detect it and keep what you've set in the previous settings. Changing the texture format will give a signature mismatch and we'll not reapply the previous material settings.
We'll probably give more control to the users in the reupload command e.g. by allowing to revert to the previous upload or selecting manually which settings should be preserved or overriden.
However things like this would require a not so simple UX so we're still thinking about the best workflow for this. Do not hesitate to give us your feedback on how you'd like the feature to work for you.