Subject some times it has ticket number, some times it doesnt

Hi guys
I am testing OTRS 5.0.27.
All is running ok, however I found the subject some times it has the ticket
number, some times it does not in the received automatic notification.
As you can see in the atached image, 3 tickets have ticket number but 1
(the last one) does not.
Any ideas about the solution?
Thanks a lot.
Karlos

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