Does Not Equal Query Not Returning Correct Results

I'm having a little trouble with a query.  My query works perfectly, until I add the very last "Where Clause"

I do not want 'Min-Max' or 'Min-Max VOI' to show up in User_4 field.  If I add any statement to this column, I get the incorrect results.  
There should be items with numbers in my results numbers and nulls.  But when I run the query, these items disappear.  Do I need to add INSTRING of some sort?

SELECT     CUSTOMER.NAME, SHIPPER.PACKLIST_ID, SHIPPER_LINE.LINE_NO AS ShipperLine, SHIPPER.SHIPPED_DATE, CUSTOMER_ORDER.CUSTOMER_PO_REF,
                      PART.DESCRIPTION, PART.PRODUCT_CODE, CUST_ORDER_LINE.DESIRED_SHIP_DATE, CUST_ORDER_LINE.PROMISE_DATE, CUST_ORDER_LINE.PART_ID,
                      CUST_ORDER_LINE.ORDER_QTY, DATEPART(YEAR, CUST_ORDER_LINE.DESIRED_SHIP_DATE) AS Year, DATEPART(MONTH,
                      CUST_ORDER_LINE.DESIRED_SHIP_DATE) AS Month, CUST_ORDER_LINE.CUSTOMER_PART_ID, SHIPPER_LINE.SHIPPED_QTY, DATEDIFF(d,
                      CUST_ORDER_LINE.PROMISE_DATE, SHIPPER.SHIPPED_DATE) AS DaysLate, CUST_ORDER_LINE.USER_4
FROM         SHIPPER_LINE INNER JOIN
                      SHIPPER ON SHIPPER_LINE.PACKLIST_ID = SHIPPER.PACKLIST_ID INNER JOIN
                      CUSTOMER_ORDER INNER JOIN
                      CUSTOMER ON CUSTOMER_ORDER.CUSTOMER_ID = CUSTOMER.ID INNER JOIN
                      CUST_ORDER_LINE ON CUSTOMER_ORDER.ID = CUST_ORDER_LINE.CUST_ORDER_ID ON
                      SHIPPER_LINE.CUST_ORDER_ID = CUST_ORDER_LINE.CUST_ORDER_ID AND
                      SHIPPER_LINE.CUST_ORDER_LINE_NO = CUST_ORDER_LINE.LINE_NO LEFT OUTER JOIN
                      PART ON CUST_ORDER_LINE.PART_ID = PART.ID
WHERE     (CUST_ORDER_LINE.PART_ID IS NOT NULL) AND (CUST_ORDER_LINE.ORDER_QTY > 0) AND (SHIPPER_LINE.SHIPPED_QTY > 0) AND
                      (NOT (CUST_ORDER_LINE.USER_4 LIKE 'MIN-%'))

TIA