please create a .sla file with one image.
if you get the error there, then show us how you see the correct layout in scribus (make a screenshot) and upload the .sla, the image (a pdf) and the resulting pdf so that we can check.
if you don't get the error there, do the same with your file (we need a screenshot showing how you see the correct layout, the .sla, the affected images and the "wrong" pdf).
and, as wrote some time ago: don't plot with scribus but export to pdfs : - )