Export CSV fieldSeparator bug?

I'm trying to make an export CSV button and the separator default is "comma" and I'm trying to change it to semicolon but it broke the CSV. the result when i export it is like this.

but if i change to different symbol or alphabet it works fine, here is my code

function InitDatatableAtt(){

        var buttons = [
            {
                extend: 'csvHtml5',
                text: 'Export CSV',
                fieldBoundary: '',
                fieldSeparator: ';'
            },
        ];

        var table = $('#dttable_att').DataTable({
            "order": [0,"desc"],
            "lengthChange":false,
            "dom": 'Bfrtip',
            "buttons": buttons
        });
}