Page Layout ⇒ Problem with A5 margin

[Beginner]

Hi.
I'm having a problem with the margins in a A5 booklet. I print it on A4 paper using psbook | psnup -Pa5 -2 and the result is that on the second page (that is, page with page number 2) it is cutting off 1 mm from the left margin text. Like a line starting with "H" is turned into "-I" (missing the left vertical line in the letter H)

I can not see this error when looking in gv, but I can see it when I print to paper (printing duplex on both sides of the paper). So what is going on here? And how to fix it?

I'm attatching the tex file.