A little problem with the title display.

[Coder-YixiangZhang-Chinese]

I use Xfce Terminal and installed the zsh shell, then run the os.sh file to set the banner and title.
It works perfect at first until I used the command sudo.
At first, the banner shows correctly, the title is set to "Debian - The World's Best Linux Distribution@LINUX"
But as I type the command sudo or use some command in sudo, the title became only [~].


But after I use the command clear to empty the terminal, the title comes back.

I wonder how can I make it always shows my customized title, or just it will dispear until I clear the terminal.