jQuery $.post() Logging Me Out On Key Down

我有一个动态的下拉搜索栏，通过在我的网页上的窗体内的数据库的成员进行搜索。要浏览这个网页，你必须先登录。当我在我的域名上建立网站时，一切都很好。然而，当我把我的文件转移到一个不同的域，并配置了一个相同的数据库，一切工作完美，除了我的动态搜索在这种形式。如果我在搜索中输入我的名字(有时是奇怪的不同的名字与工作)，一切都很好，但如果我输入其他人，它似乎应该留在页面上，但它将我注销并重新加载登录表单在其他一切之上，包括我的表单，我正在输入。我使用jQuery .post()使搜索动态。我将在

index . php

  <script>
        // this is the jQuery function used to post to the search document on key up
        function searchUserQ(){
            var searchTxt = $("input[name='userSearch']").val();
            console.log(searchTxt);
            if (searchTxt != '') {
                $.post("includes/search.php", {searchVal:searchTxt},
                    function(output){
                        $("#userResults").html(output);
                    });
            }
        }
    </script>

  <h1 class="editUser">Edit User</h1>
  <form class="editUser" action="index.php" method="post">
    <h1>Search For Employee</h1>
    <input type="text" name="userSearch" id="userSearch" placeholder="Search For Employee By First Name" onkeyup="searchUserQ();" />
    <submit type="submit" />
    <div id="userResults">
    </div>
 </form>

Search.php

<?php
    // Connect To Secure Login
    $cfgProgDir = '../phpSecurePages/';
    include($cfgProgDir . "secure.php");
    //These are the includes needed to make the php page run
    // this file connects to the database
    include("connect.inc.php");
    if(isset($_POST['searchVal'])){
        // turn that the user searched into a varible
        $searchQ = $_POST['searchVal'];
        // delete any symbols for security
        $searchQ = preg_replace("#[^0-9a-z]#i", "", $searchQ);
        $output      = "";
        $link        = "";
        $searchArray = array();
        $searchIndex = 0;
        // Search through these columns inside the main database
        $userSearchQuery = mysql_query("SELECT * FROM dealerEmployees WHERE 
            firstName   LIKE '%$searchQ%' 
        ");
        // count the number of results
        $userCount = mysql_num_rows($userSearchQuery);
        if($userCount == 0){
            // $output = "There Were No Search Results";
        }else{
            while($row = mysql_fetch_array($userSearchQuery)){
                // define dynamic varibles for each loop iteration
                $id         = $row['id'];
                $firstName  = $row['firstName'];
                $lastName   = $row['lastName'];
                $address    = $row['address'];
                $phone      = $row['phone'];
                $email      = $row['email'];
                $password   = $row['password'];
                $permission = $row['permission'];
                $photo      = "images/" . $row['profilePhoto'];
                $output .= "<li><div class='employeeSearch' style='"background: url('$photo'); width: 75px; height: 75px'"></div><h6>" . $firstName  . "</h6>" . " " .  "<h6>" . $lastName . "</h6><a href='#' class='employee' data-firstName='$firstName' data-lastName='$lastName' data-address='$address' data-phone='$phone' data-email='$email' data-password='$password' data-permission='$permission' data-id='$id'>Select Employee</a></li>";
            }
        }
    }
    echo $output;