I tried a sample use case in Pega 7.4 and attached for your reference which is exporting the data page list content correctly on each click. Kindly try this approach and let me know if you still need help on this requirement.
By default the column value will be displayed as 4.44E+11 instead of 444444000000, if you drag the column header in order to display the full number then it will be displayed completely. Hope that clarifies your doubt.
Thanks for the explanation. The file getting downloaded is a CSV type. It is not showing arabic content when opening with MS Excel 2016. Could you please tell what to do to download the file as xlsx type. Or any work around.