I created my lampshade in a different direction first and then rotated it. But when I apply the rotation now, it becomes like the last picture. Is the only way that I can solve this by converting the curve to mesh?
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It is strange, but probably because it is already linked to a bone or armature…?
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No, actually I didn’t link it to anything yet 
Maybe because your screw is on the X-ax. And you rotated before this APPLY scale rotation to the Y-ax.
go in edit mode and fix things.
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I applied the rotation to the curve first. And then I readded the screw modifier.
I would also go to edit mode of the curve, rotate it 90 degrees, and change the axis to Y.
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