Hi Viliksar,
I can not answer for every part of the world but for many countries it is normal for a multipage document such as a book to be
bound on the left hand side. This means that the first page is on the right and the left hand margin is wider to allow for any binding. The second
page - which is usually printed on the back of page 1 - has a wider right hand margin. The layout you see in Scribus is correct for this, even
if you have only two pages.
Tuxford.