So recently I tried to import some models from blender to roblox, they are imported with fbx and all of the faces are correct !
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Have you tried adding the modifier Solidify, if it doesn’t work use double sided
Did you add an unapplied “Subdivision Surface Modifier”? It could also be that you used “Shade Smooth” in Blender making the mesh look smoother than it actually is.
Check your meshes Render Fidelity and set it precise. But make sure you set it back to performance or automatic when you are done as it appears to just be a visual thing in studio
You can also check your settings
Go to Studio Settings → Rendering → Set Mesh Detail Level to DistanceBased .