Lines of code are not executed in the order they are written... Why?

I have the following fragment of code:

<script>

  someGrid = new dhtmlXGridObject('someGridContainer');
  // additional someGrid settings...

  someGrid.loadXML("url", function () {
    console.log('inside loadXML');
  });
  console.log('after loadXML');

</script>

If I run it on my local PC, I will receive:

inside loadXML

after loadXML

But when executing this within MII, I will receive:

after loadXML

inside loadXML

Why?