A file and B file have the same page size and margins.
I moved pages 1-8 of A to page 2 of B. As a result, starting from page 3, the horizontal position would shift.
They should all be right in the version, but they don't.

However, if you move all the pages (pages 1-17) of file A to the second page of B at one time.
If it is correct.

why is that?
The reason for the coordinates? I didn't find the reason
I tried: it has something to do with the chapter

File is here
http://www.fileconvoy.com/dfl.php?id=g3be56bc354f938dc1000398357f35f9b72b8e3d549

You can also create a new one yourself, it should be the same problem