Oh, that should not happen. All of my menu plugins share the same code to render faces, so the blurring should occur everywhere or not at all.
In your game project/uicustom, you will find a file called config.json. Please send it to mail@aerosys.blog so I can analyze it for you. And I also need to know your game resolution (i.e. the width&height of your game window).
Thanks!