migrated rigged, animated models ,characters from sketchfab has world and face orientation, normal map bugs and some models cannot be 3d view

Summary

Actually i tried inspect my models, when the page will launch, then no one need to worry about issues, but most of my models what was working on sketchfab normally, there are tons of issues
flipped normal
flipped poly face
flipped geometrys
doesnt load some texture maps, like reflection, or specular
sometimes cannot load the 3d view, caouse it’s freezing

What type of bug are you experiencing?

Other

URL where the bug was encountered

https://www.fab.com/portal/listings/df1e5dbc-91b2-4dea-acd5-b1a32fc88003/edit

Steps to Reproduce

normal map
orientation bugs, Like on sketchfab i could flip the green channel, but here i can’t, so it makes look like ugly

then there is the face orientation bug ( like the poly faces are flipped inside )

and also the object world orinetation bug( here it is flipped or turned in a opposite direction )

and also some model cannot be loaded in 3d view, it is freezing or loading it with issues, low reolution textures, low fps. Sketchfab dosent had it

Expected Result

nothing

Observed Result

well i wrote everithing above

Platform

google chrome

Operating System

windows 10