Query Showing Different Results When Moved To Chart In Report

I am trying to use this query. It gives me correct results as query. However when I make chart with query on a report it doesn't show correct data and eventually stops making chart

SELECT qry.txtRC, Count(tbl.txtRC) AS CountOftxtRC
FROM tblMain AS tbl, qryRC AS qry
WHERE (((tbl.txtDepartment)=[Forms]![frmRC]![cboDepartment] Or [Forms]![frmRC]![cboDepartment] Is Null) AND ((tbl.txtZone)=[Forms]![frmRC]![cboZone] Or [Forms]![frmRC]![cboZone] Is Null) AND ((tbl.txtRC )=[qry].[atnRC ID]) AND ((tbl.date) Between [Forms]![frmRC]![startDate] And [Forms]![frmRC]![endDate]))
GROUP BY qry.txtRC , tbl.txtRC
HAVING (((Count(tbl.txtRC )) Is Not Null)) OR (((Count(tbl.txtRC )) Is Not Null))
ORDER BY Count(tbl.txtRC ) DESC;