I had created a bug tracking project and it seems that when a new defect has been created the ticket ID tends to skip and not run in order. Also checked whether those missing tickets had been deleted, and no they have not been deleted.
Sequential Order:
Ticket-1, Ticket-2, Ticket-3, and so on.
In reality:
Ticket-1, Ticket-3, Ticket-6.
If anyone had encountered something similar or could share an idea I could look into would be great 