Have you tried refreshing the screen? And does the unassigned count then still show up as one?

Yes i have tried refreshing and still one unassigned is there but cant trace it

The only thing I can suggest is going to "All tickets" and exporting say the last 30 days (assume that is long enough). Make sure the dates on the initial "All tickets" screen is equal to that in the Excel/csv drop-down screen, and select at least the field Agent. Maybe you can find something in the exported list of all tickets, both open and closed ones.

Maybe you can also take a look with element inspecting that a div is hidden or something else ..

Hi tried All these options but still cant get a Solution

My suggestion would be to raise a ticket (New ticket) and get the Freshdesk support team to look at the problem.