Here is one of the lines from file1.csv file: 28,779,779,VGtSVmQwOUVZekZOUkVFeFRYcE5ORTVFV1RSTlFUMDk=,4.50875E+15,Visa,4,2019,VGtSSk5RPT0=,,,,429
See VGtSVmQwOUVZekZOUkVFeFRYcE5ORTVFV1RSTlFUMDk= became4.50875E+15. 4.50875E+15 is 4508750000000000. But VGtSVmQwOUVZekZOUkVFeFRYcE5ORTVFV1RSTlFUMDk=should be 4508750053384680.