Problems pasting pages from another document

Hi guys,

I used to copy pages from one ID document to another very easily before. I don't know why i cannot do it now.

I have both InDesign CS 6 files. I open them both in two separated windows but when i select copy from page 3 (the short 6 pages News Section) to the end into the large Document number two (the whole magazine) there is a mix of blank pages, weird styles and two new sections that never appear before.

Here is picture 1 (small document)

http://postimg.org/image/5v2lswmnh/

Here is picture 2

http://postimg.org/image/vbbmjr7n5/966147d6/

Could you help me out with that issue?

Thanks and best,
S