We have recently updated our printer to an HP M880, with a stacker/stapler addition.
I'm able to print booklets without folding or stapleing just fine, however when I turn on the feature "fold and stitch" the pages become muddled and the whole booklet gets printed.... "inside out".
This is difficult to explain so to i'll try to be clear.
The physical 4 page sheets, that create the saddle stitch pages are all stacked upside down.
The pages on the sheets are all the same way round wihin the booklet. The individual 4 page sheets are also in the correct order. However each A4 piece of paper is stacked upside down.
This results with the cover being the 2nd page, 2nd page being the cover, the third page is the 4th and the 4th the 3rd... etc. All the way round and back to the first sheet, where the last page is the 2nd last and the second last page is the back cover...
When looking at it "opened up" so you should see the front cover and the back cover, what I actually see are pages 2 and the 2nd last page. (the covers are on the other side of this sheet of paper)
The pages are there for layed out as: 2,1,4,3,6,5,8,7,10,9,12,11...etc
I've attempted the following (not limited to):
Reverse page order, this just makes it so that the same incorrect page stacking happens so that the cover and back cover are the middle and 2nd from the middle of the booklet.
portrait/landscape options (this turned the other side of the sheet upside down or right way round) ¯\_(ツ)_/¯
and a miriad number of different combinations of these three and others...