Filter's not working - Critical or High

Filter's not working - Critical or High

Hi:

Sometimes I only want to see my critical tickets or high priority. Thankfully there is a pre-defined custom filter for just such a search.

If I view all tickets - I can see various priorities from normal to High and Critical. These tickets are not closed.

Ok, so now I want just to see the critical tickets - click on your predefined search - and nothing - message says No tickets found in last 3 months. Click to view all tickets. 

Guess what, When I click to view all tickets it tells me:

No tickets found.....

I know I'm new here...but I can't figure this one out!

Any help will be appreciated.