Can't edit header.php

Strange thing. I want to ad some code to my header.php in hueman-master-child, but when I try to open it with FileZilla I get the following result:

> >

‘topbar’,’menu_class’=>’nav container-inner group’,’container’=>”,’menu_id’ => ”,’fallback_cb’=> false)); ?>



‘header’,’menu_class’=>’nav container-inner group’,’container’=>”,’menu_id’ => ”,’fallback_cb’=> false)); ?>

All the other .php files look normal, only this one doesn’t. And it doesn’t matter which one I try (a fresh download from the Hueman site or the header.php in the hueman directory, they all show the same picture.
But, here’s the weird thing: if I copy header.php to my Macbook and then open it with Pages, I can see all the code as it should be! he only problem is, I can’t save it then as a .php file…