Hi proxaal,
I doubt that there are no changes done anywhere. Looking at the source code I see:
<td class="contentheading-green" width="100%">Kyrre og Eirik kurser! </td>
1. Where does this suffix “-green” come from?
2. The demo shows that the heading of an article on the frontpage has the class “contentpagetitle” and not “contentheading”.
Conclusion: You must have done something! 😉 Look at your settings again. Guessing: Could it be that there is something in the field “page class suffix” in the settings of the Home menu item (frontpage component)?
Without access to the backend it is impossible to tell where the problem is exactly.
Regards,
Bernhard