A strange/weird problem ? charset characters

Hey.

I am facing a very strange problem. The problem is related to displayed non-english (swedish) characters on site. The problem is that some swedish characters like ” ? ” is displaying as weird/black diamond in header section but displays fine in index section.

If you have a look at
https://sites.five12apps.com/motorblocket/

You will see black diamonds in “L?gg till ny annons “. Just couple of line later, the index.php file starts and same text (L?gg till ny annons ) is hardcoded there. There it displays well :S.

So my markup is like

<br />
///header.php</p>
<p>L?gg till ny annons L?gg till ny annons </p>
<p>/////index.php<br />
get_header();?><br />
L?gg till ny annons L?gg till ny annons L?gg till ny annons<br />

I hope i make myself clear.

Summary is : The text (L?gg till ny annons) hardcoded in header.php outputs black-diamond, but the same text hardcoded in (index.php) displays correctly (same file including header.php with get_heade()).

Best Regards.