Strange Report display problem - XP and Vista - Access 2003

Hi,

I have a strange problem in displaying of reports on Windows XP and Vista.
My crosstab query display mission records for a particular month, for
employees of my organisation. For example if I search by month of "April",
the crosstab query will display all staff ( of different departments) who
were on mission in April. On Windows Vista the report displays fine, that is
the query only fetches records for APRIL. However on an XP system, apart from
APRIL records, the report is repeating staff member names along with dates of
arrival and exit of previous months. I have really failed to understand what
is causing this problem Please see the attached pictures 'XP.jpg' and
'Vista.jpg' for better understanding.

Here's my crosstab query:

TRANSFORM Count(tblMaster_TEMP.keyMasterID) AS AvgOfkeyMasterID
SELECT tblMaster_TEMP.[Mission Status] AS Msn, (tblMaster_TEMP.OrgName) AS
Agency, tblMaster_TEMP.FullName AS [Staff Member Name],
tblMaster_TEMP.Location, tblMaster_TEMP.[Mission Start] AS [Arrival Date],
tblMaster_TEMP.[Date of Exit] AS [Exit Date]
FROM tblMaster_TEMP
WHERE (((tblMaster_TEMP.[Date of Arrival]) Between #4/1/2010# And
#4/30/2010# AND tblMaster_TEMP.Location = 'ISB' AND tblMaster_TEMP.[Mission
Status] IN ('E' , 'P', 'S') ))
GROUP BY tblMaster_TEMP.OrgName, tblMaster_TEMP.[Mission Status],
tblMaster_TEMP.FullName, tblMaster_TEMP.Location, tblMaster_TEMP.[Mission
Start], tblMaster_TEMP.[Date of Exit]
PIVOT Format([Date of Arrival],'Short Date') In
(4/1/2010,4/2/2010,4/3/2010,4/4/2010,4/5/2010,4/6/2010,4/7/2010,
4/8/2010,4/9/2010,4/10/2010,4/11/2010,4/12/2010,4/13/2010,
4/14/2010,4/15/2010,4/16/2010,4/17/2010,4/18/2010,4/19/2010,
4/20/2010,4/21/2010,4/22/2010,4/23/2010,4/24/2010,4/25/2010,
4/26/2010,4/27/2010,4/28/2010,4/29/2010,4/30/2010);

I'll be grateful if someone can help me. Many thanks.

URL for images:
Vista: http://www.mediafire.com/imageview.p...ey=0nxqwntmnmd

XP: http://www.mediafire.com/imageview.p...ey=gdazznyyom5