Query Generating Different Results

If I use this query I get the results what I want

SELECT tblMainTWTTPSheet.txtRootCause, Count(tblMainTWTTPSheet.txtRootCause) AS CountOftxtRootCause
FROM tblMainTWTTPSheet
GROUP BY tblMainTWTTPSheet.txtRootCause
HAVING (((tblMainTWTTPSheet.txtRootCause) Is Not Null) AND ((Count(tblMainTWTTPSheet.txtRootCause)) Is Not Null))
ORDER BY Count(tblMainTWTTPSheet.txtRootCause) DESC;

But What I am trying to do is on a form select dates and generate data in this query. which doesnot happen even if I use the following query.

SELECT tblMainTWTTPSheet.txtRootCause, Count(tblMainTWTTPSheet.txtRootCause) AS CountOftxtRootCause
FROM tblMainTWTTPSheet
WHERE (((tblMainTWTTPSheet.date) Between [Forms]![frmStratificationOfRootCauses]![startDate] And [Forms]![frmStratificationOfRootCauses]![endDate]))
GROUP BY tblMainTWTTPSheet.txtRootCause
HAVING (((tblMainTWTTPSheet.txtRootCause) Is Not Null) AND ((Count(tblMainTWTTPSheet.txtRootCause)) Is Not Null));