Hi Booleano, your path curve is not smooth, there are some spots that have sharp corner points.
When you do a sweep on a path that has sharp corners, it will make mitered corners by extending surfaces where they meet at the sharp corners and intersecting them with each other.
The intersection is easier to do on your shape B, on shape A it's having difficulty getting a clean intersection so you are left with the extended pieces.
I've attached a version where I've made the path to be smooth without any sharp corner spots and that should sweep better now.
- Michael
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