php - Date format coming in weird way in CSV file using codeigniter

I have a codeigniter function to create a CSV file for the user data from a DB.

My function is this:-

function user_CSV()
{
    $filename = 'CSV_User_Report.csv';      
    $this->load->dbutil();      
    $this->load->helper('file');        
    $this->load->helper('download');        
    $delimiter = ",";        
    $newline = "\r\n";  
    $queryUser = "SELECT user_name AS Name, 
                    user_username AS Username, 
                    user_mobile AS Mobile, 
                    DATE_FORMAT( user_added_date, '%d-%m-%Y' ) AS `Joining Date`,
                    DATE_FORMAT( user_last_activity, '%d-%m-%Y' ) AS `Last Acitivity`
                FROM tbl_user"; 
    $dataResult = $this->db->query($queryUser);
    if($dataResult->num_rows()>0)       
    {   
        $data = $this->dbutil->csv_from_result($dataResult, $delimiter, $newline);      
    }   
    if(force_download($filename, $data))        
    {           
        redirect('admin/user');     
    }
}
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Now, this one is creating the CSV file. But there is a severe issue. To illustrate that, I am sharing the screenshot of the CSV.

But, when I am trying to see the query in phpmyadmin, I am getting the result like this:-