Column Sorted on Render

Full Code

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>ZingGrid: Blank Grid</title>
  <script nonce="undefined" src="https://cdn.zinggrid.com/zinggrid.min.js"></script>
  <style>
    .zg-body {
      background: #e6e6e6;
    }

    zing-grid[loading] {
      height: 357px;
    }
  </style>
</head>

<body class="zg-body">

  <zing-grid caption="Numbered Strings" layout="row" sort>
    <zg-data data='[
        { "number": 4510 },
        { "number": 210 },
        { "number": 0 },
        { "number": 649 }
      ]'></zg-data>
    <zg-colgroup>
      <zg-column index="number" header="Not Sorted"></zg-column>
      <zg-column index="number" type="number" header="Sorted" cell-class="correct" sort-asc></zg-column>
    </zg-colgroup>
  </zing-grid>

  <script>
    ZingGrid.setLicense(['26ccbfec16b8be9ee98c7d57bee6e498']);
  </script>
</body>

</html>