Cells are over lapping each other

[tasmanwebsolutions]

I am new to phpexcel When I create a excel file the cells are overlapping each other as shown in image I have tried setrowHeights etc and lots more non seem to work. I am using libreOffice and MSoffice same issues.

I am really stuck on this any one can help me on this thanks

<?php

class Events extends MX_Controller {

    public function generate_excel() {

        $query = $this->db->get('event');
        $excelresults = $query->result_array();

        require (APPPATH . 'third_party/PHPExcel-1.8/Classes/PHPExcel.php');
        require (APPPATH . 'third_party/PHPExcel-1.8/Classes/PHPExcel/Writer/Excel2007.php');

        $objPHPExcel = new PHPExcel();

        $objPHPExcel->getProperties()->setCreator("");
        $objPHPExcel->getProperties()->setLastModifiedBy("");
        $objPHPExcel->getProperties()->setSubject("");
        $objPHPExcel->getProperties()->setCreator("");
        $objPHPExcel->getProperties()->setDescription("");

        $objPHPExcel->setActiveSheetIndex(0);

        $objPHPExcel->getActiveSheet()->SetCellValue("A1", 'Event');
        $objPHPExcel->getActiveSheet()->SetCellValue("B1", 'Event Title');
        $objPHPExcel->getActiveSheet()->SetCellValue("C1", 'Event Date');
        $objPHPExcel->getActiveSheet()->SetCellValue("D1", 'Event Start Time');

        $objPHPExcel->getActiveSheet()->getPageSetup()->setOrientation(PHPExcel_Worksheet_PageSetup::ORIENTATION_LANDSCAPE);
        $objPHPExcel->getActiveSheet()->getPageSetup()->setPaperSize(PHPExcel_Worksheet_PageSetup::PAPERSIZE_A4);

        foreach(range('A','D') as $columnID) {
            $objPHPExcel->getActiveSheet()->getColumnDimension($columnID)
                ->setAutoSize(true);
        }

        $headerstyle = array(
            'font'  => array(
            'size'  => 24,
            'name'  => 'Candara'
            )
        );

        $objPHPExcel->getActiveSheet()->getStyle('A1:D1')->applyFromArray($headerstyle);

        $excelrow = 2;

        foreach ($excelresults as $excelresult => $excelvalue) {

            $columnstyle = array(
                'font'  => array(
                'size'  =>24,
                'name'  => 'Candara'
                )
            );

            $objPHPExcel->getActiveSheet()->getStyle('A' . $excelrow . ':D' . $excelrow)->applyFromArray($columnstyle);

            $objPHPExcel->getActiveSheet()->getRowDimension($excelrow)->setRowHeight(-1);

            $objPHPExcel->getActiveSheet()->SetCellValue("A" . $excelrow, $excelvalue['event']);
            $objPHPExcel->getActiveSheet()->SetCellValue("B" . $excelrow, $excelvalue['event_title']);
            $objPHPExcel->getActiveSheet()->SetCellValue("C" . $excelrow, $excelvalue['event_date']);
            $objPHPExcel->getActiveSheet()->SetCellValue("D" . $excelrow, $excelvalue['event_start_time']);

            $excelrow++;
        }

        $filename = 'Bowling-Events-For-' . date('Y') . '.xlsx';

        $objPHPExcel->getProperties()->setTitle("Riwaka Bowling Club Events");

        header("Content-Type: application/vnd.ms-excel; charset=utf-8"); # Important 
        header("Content-Type: application/force-download");
        header("Content-Type: application/octet-stream");
        header("Content-Type: application/download");

        header("Content-Disposition: attachment; filename=".$filename."");
        header("Content-Transfer-Encoding: binary");

        header("Pragma: no-cache");

        header("Expires: 0");

        header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
        header("Cache-Control: private",false);

        $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
        $objWriter->save('php://output');

        exit();
    }
}