Wrong name displayed when addressing Confluence-User with the @ Symbol or in searchbar

[Deleted user]

Hello,

I have a litte problem with Confluence (Version 5.6.6). When I address a Confluence-User with the @ Symbol on any page or if I type his name in the searchbar the Confluence-user is displayed with a wrong name. His name was changed in our Active Directory.

If I look on his profile (confluenceurl.de/confluence/display/~user.name) the name is displayed correctly.

I tried to finde the wrong name in our database but with no success. What could cause this problem?

I would be glad if someone could help me or has some tips to solve the problem.

Best regards