List Box Not Populating Properly

I am trying to create a report that displays multiple records in a list box
based on a field (WO KEY) on the report. The feild is a member of the main
report record source and the unbound list box values are generated by a query
in the row source of the list box. When I view the report in print preview,
the query runs and inserts the correct values associated with the first field
in the list box for all of the records in the report record source. Does
anyone know how I can fix this so the report displays the values that are
associated with each record in the record source and not just the first
instance for all?

Here is the query I using in the row source of the list box
SELECT DISTINCT tblWOS.SERV_EXT_BEF_WOS AS Before, tblWOS.SERV_EXT_AFT_WOS
AS After, tblWOS.SERV_CDE_BIL_WOS AS Service, tblPrices.Price
FROM tblWOS INNER JOIN tblPrices ON tblWOS.SERV_CDE_BIL_WOS =
tblPrices.Service
WHERE (((tblWOS.WO_KEY_WOS)=[Reports]![rptwo]![WO KEY]));

Thanks

Alex