Lookup Criteria Problem

Lookup Criteria Problem

Hi,

I don't know why some time lookup field which was set with criteria doesn't show the correct thing. 

Application "Penta CRM 10"
Forum "TATA Send Quotation "
Lookup "Select Ticket No" - Link with "To DO Form"
Criteria - "Call_Status.contains("scheduled") && Customer_Name_Lookup.contains("tata")"

Our one of the ticket no 21396 doesn't show up !!

Thanks