Trouble searching by ticket number

I have osticket 1.9.14 running on a ubuntu server and all is well except when I try to use the search box with the ticket number it returns ALL tickets - open and closed tickets. Not the one I put in the field. Keyword & User's name searches work fine. I tried with the ticket prefix and without - no change. My ticket format is: NNCC-######  ... Am I missing something simple? Thanks!