The links in the sidebar on the frontpage has suddenly became bold.

Suddenly some of the links in my sidebar has become bold, even that I haven′t changes the stylesheet in the editor. I have also checked the code in the editor, (the part that concerns the sidebar), that the text-weight is assigned the value “normal”. This problem only occurs on my first page, not if you click on to see older posters (than the webpage is shown as it use to). I also having problems with some of my posts on the first page, that the text becomes bold even if i have not made it that way. When the post goes to side 2 and so on, they are shown correctly. Can somebody please help me with this? It′s really frustrating…