[Grml] odd console output

Hello. If I run the system by runlevel 1 (or 3) and type the command ls, zsh shows the following (as a normal user the same):

;root@hostname: ls [without any line breaks]

The odd thing is that when I run the shell by a terminal emulator (in my case xfce4-terminal) the output is OK.

set authenticate zifumuur

set delivery off