Mesh bug or idk (HELP)

what happen?
some parts of my mesh look weird

in blender everything is fine
what should I do?

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The face is the wrong way around. Exporting for blender
I had the same problem. Scroll down.

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To be clear with the previous answer, your normals are probably inverted. Flip them.

If that didn’t help, which i doubt, can you verify that double-sided is enabled (if your mesh is on a MeshPart)

try double siding it on properties