@LucasPereira
So, for your Data de Vencimento queue column you have a Primary Data Source of Due Date and a Secondary Data Source of SLA Due Date. The Due Date value is pulled from the duedate column in the ost_ticket table, and the SLA Due Date value is pulled from the est_duedate column in the ost_ticket table.
Since the column is blank, this means the ticket does not have a duedate value nor a est_duedate value in the database. This is because, if a Ticket is being Closed and the Due Date is in the past the system clears the duedate and est_duedate values. If a Ticket is being Closed and the Due Date is in the future still the system does not clear these values.
I hope this clears up your confusion.
Cheers.