I'm trying to figure out why the Ticket Owner is blank, but the Ticket Owner Name isn't.

Referring to the attachments:

1st Screenshot: Zoho Desk

Ticket Owner is unassigned, but an agent has interacted with the ticket. 

2nd screenshot: Zoho Analytics > Tickets table

Ticket Owner is blank, but the agent who interacted with the ticket reflects in the Ticket Owner Name

Why would the agent's name reflect in the Ticket Owner Name, if he isn't the owner of the ticket?