Never heard of this problem. I tried to duplicate with the "DataOverview.dr" report (Order entry workspace) and added a page layer to it. Export is the same as in the preview. With image quality high the images in the pagelayer are printed with a better quality.

So, please tell us how to reproduce. I suggest you create a support ticket in HDE (https://hde.dataaccess.eu) and upload report plus data so that we can evaluate the situation.