conversion of CBR/CBZ to PDF : output is not normal format
 

hello,

when I use Calibre to convert these files (CBR/CBZ) they generate a pdf which is "cropped". is does not come a normal A4 format. the width seems normal but the height is compressed and does not take the whole page. I can read the text and see the images but it is distorted.
what can I do about it. Is it linked to my parametrisation or is a general problem (I don't find any litterature on this on internet).

thanks,

I did the changes and it works fine in many CBR or CBZ conversions. Yet now there are still one out of 2 or 3 which completely fail and I get a warning from Calibre saying "failed". (i have a sample of about 70 to 80 conversion in the meantime)
what can be the problem ?