Strange loading of views...

[eluser]Unknown[/eluser]
Hi, I'm quite new to CI, so the question is:

Why, when I'm loading header straight away(header is view of course), it appears under other views, which area loaded after passing 3rd argument to view loader, and then printing them ?

If I make same action for the header view(I mean keeping it in the string and then printing) , it appear above all other views - wanted result.

Thanks