the wizard cannot do this for you.
you will need to update the recordset.
double click the WADADynListmembers recordset in the server behaviors panel and change the SQL:
SELECT Specialty_1, Specialty_1 FROM members ORDER BY Specialty_1
to:
SELECT Specialty_1, Specialty_1 FROM members ORDER BY Specialty_1 GROUP BY Specialty_1
or you could use:
SELECT DISTINCT Specialty_1 FROM members ORDER BY Specialty_1