Authors page

On the author's page website.com/author/name1 The blog previews have following format: Categories Title Date by Name2 Unfortunately, the author's name (name2) is not correct. When I click the link of that name (name2) it leads to the other author's page website.com/author/name2 When I click on the blog preview by title or "more...", it displays the blog entry correctly. What can I do, to fix this problem? Does it have to do something with the author or user IDs? I don't know where to look. I have the Shutter Up Free Theme.