[Scribus] png with transparent background ist placed out of A4 paper

[Ekkard Gerlach]

My scribus drawing with a png-image with a transparent 
background is printed somewhere else in or out of my 
A4-sheet. Kyocera600 Laser (PCL) prints about 10cm above, 
the Konica Magicolor 2350 (Postscript) doesn't print it at all. 
Here is the document http://www.aiai.de/no_X.sla

I wonder why the postscript file generated with scribus 
contains the png image, but the printers ignore or 
move the png to somewhere else. 

using scribus 1.2.1 

tia 
Ekkard