1, manufacturing error: In the process of automobile production, due to improper process control or mold problems, manufacturing error, dimensional deviation or uneven surface of the rear fender may occur, resulting in the lining not being completely wrapped.

2. Collision or damage: The rear fender will be damaged due to accidents such as collision or scraping of the vehicle, and there are problems such as improper assembly during maintenance, resulting in the lining not being completely wrapped.

3. Improper installation: When repairing or replacing the rear fender of the vehicle, errors or failure to follow the standard process during installation will lead to incomplete lining package.