Ticket ID missing on Time Entries

Hi all

Sorry if my question makes no sense as I am new here

I’m working on PowerBI to fetch the data from the API and create reports out of it. I’m Working on tickets and Time Entries from Freshdesk.

I requested Tickets which responded me with past 30 days of data. I requested Time entries which returned me some data.

Now my question is I noticed that some of the Ticket Id from the tickets can’t be seen in time entries.

Is there a reason for this or do I misunderstood anything here.

I sincerely thanks for your time

Regards
Fazil M