PROBLEM:
You upgraded recently to 5.4 version of the K1000. Before you upgraded, the problem did not exist.

When you click the View By > Owners in the Service Desk module of the help desk, the user names there are not what should be there. 

SOLUTION:
There is a new feature for each user to have their own Default Queue which can be set under each user's account.

Adjust this accordingly to resolve the issue.