Ok so I was trying to make headphones in blender and I’m still somewhat new to blender but for some reason when I bring it into studio is glitches… rlly bad too.
It looks like your Normals are inverted.
If you use the Face Orientation tool make sure that you see the blue faces in Blender, not the Orange faces.
Your MeshPart Material looks like its set to Plastic.
You also need to research how to bake the colours (Texture) into the MeshPart.
Go in blender, select all objects and press ctrl + n, if this does not work make sure that you check the DoubleSided property of the mesh inside studio.