其他会话工作时不显示会话消息

问：

我有一个添加更新和删除按钮，添加按钮和更新工作正常，并相应地显示我的会话消息和msg_type，但是当我单击删除按钮时，即使记录被删除，我也不会收到任何会话消息。我所有的添加、更新和删除文件都来自一个名为 authController 的同一个文件，我在文件的开头调用了一个session_start函数。

在我的PHP文件中，我调用该函数来显示会话消息

<?php if (isset($_SESSION['message'])): ?>
<div class="alert alert-<?=$_SESSION['msg_type']?>">
   <?php
        echo $_SESSION['message'];
        unset($_SESSION['message']);
   ?>
</div>
<?php endif ?>

这是我authController.php中的删除功能;

    if(isset($_POST['delete_employee'])) {

        $name = $_POST['name'];
        $email_address = $_POST['email_address'];
        $address = $_POST['address'];
        $telephone = $_POST['telephone'];
        $role = $_POST['role'];
        $competency = $_POST['competency'];
        
        $key = $_POST['keyToDelete'];

        //check if records exists to delete or not
        $sql= "DELETE FROM employees WHERE id='$key'";
        $result= mysqli_query($db, $sql);

        if($result) {
            //send flash messages
            $_SESSION['message'] = "Employee record Deleted !";
            $_SESSION['msg_type'] = "danger";
            header("Location: Employee.php");
        } 
    }

    if(isset($_POST['add_job'])) {

        $job_name = $_POST['job_name'];
        $department = $_POST['department'];
        $competency = $_POST['competency'];
        $competent=implode(',',$competency);

        $sql = "INSERT INTO job (`job_name`, `department`, `competency`) VALUES ('$job_name', '$department', '$competent')";
        $result = mysqli_query($db, $sql);

        if($result) {
            $_SESSION['message'] = "Job Role succesfully added !";
            $_SESSION['msg_type'] = "success";
            header("Location: Job.php");
        }
    }

此外，当我调用另一个页面中的另一个添加函数时，记录已成功添加，但未显示会话消息。有人可以告诉我我在哪里犯了错误，因为我找不到错误，除了未显示的会话消息外，一切似乎都正常工作。