Why this mesh is like that

this is in studio
go in

this is the original in blender
the bel


Your normals are most likely flipped. Just go into Blender, select the faces that are appearing invisible, and hit “Flip Normals”

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If I had to guess I’d say the faces shown are probably inverted Normals. In the edit mode click the following buttons. Viewport overlays>Display Normals. I’ve included a photo to show what that looks like. if there is a blue line sticking out of it It’s flipped. If this is the case you can select the flipped Normals and use the Alt+N shortcut or from the flip them directly from the Mesh button