sum in footerCallback with scroller problem

Hi,
I using sum (current page) in footerCallback with scroller to respect the filters and feet.
In scrooler, sum change and not really totals.
My code:

$.ajax({
    type: 'POST',
    url: 'Rel.aspx/GetData',
    contentType: 'application/json; charset=utf-8',
    dataType: 'json',
    data: '{cli: 0, ger: 0, parc: 0, dataI: '"2017-05-01"','"2017-05-15"', band: 0, tipo: 0, stat: 0}',
    success: function (msg) {
        var numFormat = $.fn.dataTable.render.number('.', ',', 2, '').display;
        var ret = msg.d.split('@');
        var erro = ret[0].indexOf('Erro') != -1;
        var arq = !erro ? ret[0] : fillEmptyTable();
        var table = $('[id$=myTable]').DataTable({
            sDom: '<"H"lBfr>t<"F"ip>',
            order: [[1, 'asc'], [2, 'asc'], [0, 'asc']],
            pagingType: 'full_numbers',
            lengthMenu: [[5, 10, 25, 50, 100, -1], [5, 10, 25, 50, 100, 'Todos']],
            iDisplayLength: -1,
            searchHighlight: true,
            jQueryUI: true,
            ajax: arq,
            orderClasses: true,
            deferRender: true,
            destroy: true,
            scrollX: true,
            scrollY: '38vh',
            scrollCollapse: true,
            scroller: true,
            select: { style: 'single' },
            initComplete: function () {
                $('input[type=search]').addClass('clearable');
                setTimeout(function () { $('[id$=myTable]').DataTable().columns.adjust() }, 10);
            },
            columns: [
                { width: '30%' },
                { width: '8%' },
                { width: '8%' },
                { width: '6%' },
                { width: '10%' },
                { width: '10%' },
                { width: '4%' },
                { width: '10%' },
                { width: '2%' },
                { width: '30%' },
                { width: '30%' },
                { width: '30%' }
            ],
            columnDefs: [
                {
                    type: 'date',
                    targets: 1,
                    mRender: function (data, type) {
                        return (type == 'display')
                            ? formatDate1(data)
                            : data;
                    }
                },
                {
                    type: 'num-fmt',
                    targets: 7,
                    sClass: 'right',
                    mRender: function (data, type) {
                        return (type == 'display')
                                   ? numFormat(data)
                                   : data;
                    }
                },
                {
                    targets: 9,
                    title: cliId == 4 ? 'Aluno' : 'Adic.&nbsp;1'
                },
                {
                    targets: 10,
                    title: cliId == 4 ? 'CPF' : 'Adic.&nbsp;2'
                },
                {
                    targets: 11,
                    title: cliId == 4 ? 'Matrícula' : 'Adic.&nbsp;3'
                }
            ],
            language: dataTableLanguagePTBR,
            buttons: [
                {
                    extend: 'excelHtml5',
                    text: '<img src="/images/Excel24x24.png" width="24" height="24" alt="">',
                    titleAttr: 'Exportar para Excel',
                    title: 'Analítico de Notas Fiscais - ' + $('[id$=tit]').val(),
                    exportOptions: {
                        columns: ':visible',
                        orthogonal: 'export'
                    }
                },
                {
                    extend: 'print',
                    text: '<img src="/images/printer24x24.png" width="24" height="24" alt="">',
                    titleAttr: 'Imprimir',
                    message: '  Impresso por: <strong>' +
                        'Test' +
                        '</strong> em: <strong>' +
                        formatDateTime1(new Date()) +
                        '</strong>',
                    exportOptions: {
                        columns: ':visible'
                    },
                    customize: function (win) {
                        $(win.document.body)
                            .css('font-size', '10pt');

                        $(win.document.body).find('table')
                            .addClass('compact')
                            .css('font-size', 'inherit');

                        $(win.document.body).find('h1')
                            .html('');
                    }
                },
                dataTableScrollButton
            ],
            fnRowCallback: function (nRow, aData) {
                if (aData[8] == 'Canc.') {
                    $(nRow).css('color', '#ff0000');
                }
                if (aData[10] != '') {
                    $('td:eq(9)', nRow).html(aData[9].toUpperCase());
                    $('td:eq(10)', nRow).html(cpf_mask(aData[10]));
                }
            },
            footerCallback: function (row, data, start, end, display) {
                var api = this.api();

                var intVal = function (i) {
                    return typeof i === 'string' ?
                        i.replace(/[\$,]/g, '') * 1 :
                        typeof i === 'number' ?
                        i : 0;
                };

                var pageTotal = api
                    .column(7, { page: 'current' })
                    .data()
                    .reduce(function (aT, bT) {
                        console.log(intVal(aT) + intVal(bT));
                        return intVal(aT) + intVal(bT);
                    }, 0);

                $(api.column(7).footer()).html(
                    numFormat(pageTotal)
                );
            }
        });
    },
    error: function (xhr) {
        alert(xhr.responseText);
    }
});