IE9更改html ajax响应

I use jQuery Form Plugin, I send some data to server and then recieve HTML which I insert on my Page.

    $('form').ajaxForm({
        success: function(response) {  }
    });

response is some HTML. This HTML is not valid. So this is

<tr><td>some</td></tr>

FF and Chrome recieve same HTML which I send from server. But IE clears all

<tr> and <td>.

This is very bad. How can I fix it?