vBulletin load 2 times global.php

[MAORBARI]

I think I found mini bug,
I open new table on my PHPMYADMIN,
Than I enter to "global.php" file, and add code that will add 1 to the exit number (if 0 it need up to 1, if it 1 in need up to 2) when enter to some page on web.
I check the value after one refresh on main page of my website, and it up to 2 from 0, I thought it mistake, so I tryed again, and again it up to 4 from 2, and again and again,
so I tryed to disable my hooks and go to default style, and it didn't help.
I continue to check and I found that the function fetch_template and print_output, when they come together it happened.
how I can fix it? and it bug or what?

Thank you a lot !