BootstrapTable start columns render twice

Here's what's going on

I can't figure out why the headers in the columns appear twice. I have the same code on other pages and it doesn't.

JQuery

var $table = $('#table-javascript').bootstrapTable({
    method: 'get',
    url: 'bootstrap_database_email_history.php',
    height: 300,
    cache: false,
    striped: true,
    pagination: true,
    search: false,
    pageSize: 20,
    pageList: [20, 40, 60, 100, 200],
    minimumCountColumns: 2,
    clickToSelect: true,
    columns: [{
        field: 'date',
        title: 'Date',
        align: 'left',
        width: '100'
    },{
        field: 'email', 
        title: 'Email',
        align: 'left',
        width: '20'
    },{
        field: 'sent',
        title: 'Sent',
        align: 'center',
        width: '20'
    },{
        field: 'notsent',
        title: 'Not Sent',
        align: 'center',
        width: '20'
    }]
});

      

        
        
        
      

    

Html

<table id="table-javascript"></table>

      

        
        
        
      

    

bootstrap_database_email_history.php

<?
include('../includes/connect.php');
$sql = "SELECT * FROM table WHERE this = '$this' ORDER BY ID DESC";
$result = mysql_query($sql);
$records = mysql_num_rows($result);
if ($records == 0) {
    $data['posts'][$i] = $response[$i];
}
$i = 0;
while ($row = mysql_fetch_array($result)) {
    $response[$i]['date'] = $row['date'];
    $response[$i]['email'] = $row['email'];
    $response[$i]['sent'] = $row['sent'];
    $response[$i]['notsent'] = $row['notsent'];
    $data['posts'][$i] = $response[$i];
    $i = $i+1;
    unset($slot);
}
echo json_encode($data['posts']);
?>

      

        
        
        
      

    

ANSWER JSON RESULTS

[{
    "date":"04\/30\/15",
    "email":"user@user.com",
    "sent":"<\/i>",
    "notsent":""
},{
    "date":"04\/30\/15",
    "email":"user@leader.com",
    "sent":"<\/i>",
    "notsent":""
},{
    "date":"04\/30\/15",
    "email":"user@admin.com",
    "sent":"<\/i>",
    "notsent":""
}]