Cross Tab Headers/Data do not match report when exported to excel

I have a report that contains a crosstab in  the summary section.  The Columns are all date based and the rows based on user name.  When I run a report containing a cross tab and execute it through the JaserReports Server, it matches the report preview from iReports exaclty.  When I export the data to Excel from the report server , the column headers start at an earlier date and the count changes under each date, but the row columns are all correct.  I have attached screenshots.