AJAX lifts objects up how so?

Question

JavaScript

Good day in js a little teapot
But the essence of the matter is that with a new message it goes up, but it should go down I can’t understand what
Js is

$(document).ready(function()
{
var content = $("#content"),
loading = "<img style='text-align:center;' src='/images/loading.gif'>";
function chat_js()
{



    // Подгрузка новых записей
    $.ajax({
      url: "/Ajax/chat.php?",
      dataType: "html",
      type: "GET",
      data: {type: "start1", url: "/chat.asp" + location.search},
            success: function(responce){
            $("#content").after(responce);
            }
    });


}
function chat_js2()
{
// Подгрузка первых записей
    $.ajax({
      url: "/Ajax/chat.php?",
      dataType: "html",
      type: "GET",
      data: {type: "start", url: "/chat.asp" + location.search},
      beforeSend: function(){

        $("#content").append("<div class='jscroll-loading' align='center'>" + loading + "</div>");
      },
      success: function(data){

        if(data){

          content.append(data);
          content.find(".jscroll-loading:first").slideUp(700, function(){

            $(this).remove();
          });

          
        };
      }
    });


}
setInterval(function()
{
chat_js();
}, 1000);
chat_js2();

  });

PHP

if(isset($_GET["type"]) && $_GET["type"] === "start"){
$chat = $db->query("SELECT * FROM `chat` ORDER BY `id` ASC LIMIT  $start, $max");
while ($a = $chat -> fetch_assoc()) {
echo '<div id="post'.$a['id'].'">';
if($_SESSION[$id.'chlid']<$a['id']){
$_SESSION[$id.'chlid'] = $a['id'];
}

if(isset($_GET["type"]) && $_GET["type"] === "start1"){
$start = 0;
$chat = $db->query("SELECT * FROM `chat` WHERE `id` > '".$_SESSION[$id.'chlid']."' ORDER BY `id` ASC LIMIT  $start, $max");
while ($a = $chat -> fetch_assoc()) {
echo '<div id="post'.$a['id'].'">';
if($_SESSION[$id.'chlid']<$a['id']){
$_SESSION[$id.'chlid'] = $a['id'];
}

I can’t understand how this happens, even though the output is ASC, but not DESC

When the main information is loaded, everything is fine, but when they start adding a post, they go up as if php is set to DESC, not ASC