Problem with swedish letters in labora

Hello
Ive discovered a new very odd problem happening with some letters in the text of your theme.
In my language I have å, ä and ö. And sometimes they act oddly in safari and firefox in a a mac inviroment. But not all of them, as you can see in the screenshots.
They disapear or become bold. But it doesnt happen every time. Is this something you’ve seen before and can help me with. I’ll send along some screenshots. This site will go live soon, so some quick assistance would be appreciated.

I’ve also written to you on skype.