Hello,
The WPBakery CSS Generator creates a custom CSS file by including only the styles needed for the WPBakery elements you’re actually using. Since WPBakery’s default CSS file is quite large (and includes styles for elements you may never use), generating a custom file can significantly improve performance — often reducing CSS file size by 200–400 KB.
However, it’s important to manually check the elements you’re using across your site before generating the file. If you leave out elements that are in use, it can cause layout or alignment issues like you experienced.
Best Regards,