LogOn instead LogOff link appears in masthead for 1 user

Hi gurus,

There is the strange problem for 1 user:

LogOn link instead LogOff link appears in masthead for 1 user. User has various roles - content_admin_role, Administrator, eu_role etc

The property called "Show Link in Masthead: Log off" enabled and everything is O.K. for other users

I don't understand why this user see "LogOn" link

Any suggestions?

Thank in advance,

Elena