Well it's kinda simple: instead of numbering them as usually you would (1,2,3,4,5,6,7,8,9...) it swaps the facing pages around making it 1,3,2,5,4,7,6,9,8...
If it was just about numbers showing weird i could live with that but the problem comes when I try to export: it then reorganizes the pages making them go to the right order but then the page that should be 2 become 3 and so on...
How can I fix this? Why is it doing it?