MySQL DateTime Query Problem

If I do a query in the MySQL workbench, I get 8 records (which is correct), but when I do the same query in my program, I only get the 1st 2 records. The only thing I'm really querying against is a tblARInvoice.Invoice_Date datetime field.

txtYY.text contains the last 2 digits of the year. ex 10 for 2010
txtMM.text contains 2 digits for the month. ex 09
txtDD.text contains 2 digits for the day. ex 03

The majority of the select statement is below.

What am I doing wrong to get different results?

SELECT 
Clients.FNAME, tblARInvoice.SEQ, tblARInvoice.Invoice_Date AS 'INVOICE_DATE', tblARInvoice.YEAR, tblARInvoice.strStatus AS 'STATUS', tblARReceipts.DATE as 'RECEIPT DATE' 
FROM tblARInvoice INNER JOIN Clients ON tblARInvoice.strClientSIN = Clients.SIN LEFT OUTER JOIN tblARReceipts ON tblARInvoice.strINVOICE_NUMBER = tblARReceipts.strInvoiceNumber 
WHERE (tblARInvoice.Invoice_Date <= '20" & txtYY.Text & "-" & txtMM.Text & "-" & txtDD.Text & "')  ORDER BY tblARReceipts.DATE, Clients.LNAME, Clients.FNAME

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