Footer Total repeating in pdf ?

alka

when I am printing the report, in pdf its footer is repeating. Please help

    $(document).ready(function() {
        var hidden_startdate_avail = $(".hiddendate_avail1").val();
        var hidden_enddate_avail = $(".hiddendate_avail2").val();
        $('#table_id').DataTable({
            paging: false,
            scrollY: 780,
            fixedHeader: {
                footer: true
            },
            "order": [],
            "oLanguage": {
                "sEmptyTable": "No Data available for this selection"
            },
            dom: 'Bfrtip',
            buttons: [{
                extend: 'csvHtml5',
                text: '',
                titleAttr: 'Download CSV',
                extension: '.csv',
                filename: 'Time Tracking Report - with Session details',
                exportOptions: {
                    modifier: {
                        page: 'current'
                    }
                }
            }, {
                extend: 'pdfHtml5',
                text: '',
                titleAttr: 'Download PDF',
                alignment: 'center',
                bProcessing: true,
                footer: true,
                title: 'Time Tracking Report - with Session details',
                orientation: 'landscape',
                pageSize: 'LEGAL',
                message: 'Start Date:: ' + hidden_startdate_avail + ' - End Date:: ' + hidden_enddate_avail,
                pageSize: 'A4',
                exportOptions: {
                    modifier: {
                        page: 'current'
                    }
                }
            }],
            "footerCallback": function(row, data, start, end, display) {
                var api = this.api(),
                    data;

                // Remove the formatting to get integer data for summation
                var intVal = function(i) {
                    return typeof i === 'string' ?
                        i.replace(/[\$,]/g, '') * 1 :
                        typeof i === 'number' ?
                        i : 0;
                };

                // Total over all pages
                total = api
                    .column(6)
                    .data()
                    .reduce(function(a, b) {
                        var a = intVal(a) + intVal(b);
                        var a = a.toFixed(2);
                        return a;
                    }, 0);

                // Update footer
                $(api.column(6).footer()).html(+total);
            }
        });
        $('#table_id tbody')
            .on('mouseenter', 'td', function() {
                var colIdx = $(table.cell(this)).index().column;

                $(table.cells().nodes()).removeClass('highlight');
                $(table.column(colIdx).nodes()).addClass('highlight');
            });
        $(".pdf_icon").click(function() {
            $(".loadingData").show();
            setTimeout(function() {
                $(".loadingData").hide();
            }, 500);
        });

        $(".csv_icon").click(function() {
            $(".loadingData").show();
            setTimeout(function() {
                $(".loadingData").hide();
            }, 500);
        });
        $('#table_id1').dataTable({
            paging: false,
            scrollY: 780,
            "order": [],
            "oLanguage": {
                "sEmptyTable": "   "
            }
        });
    });