Displaying data in table format from mysql database with php loop

Need to display retrieved data from mysql table in table format, but not getting the right display i planned for. This is how i want it to look like Target display

But this is what am getting based on my code Current display

This is the html code

<div>
        <table class="table table-striped table-hover">
            <thead>
                <tr>
                    <th>First Name</th>
                    <th>Last Name</th>
                    <th>Department</th>
                    <th>Action</th>
                </tr>
            </thead>
            <tbody>

                <?php
                    $staff_set = find_all_employee();
                    while ($staff = mysqli_fetch_assoc($staff_set)) {
                        //display staff first name, last name, department and action (edit and delete links)
                ?>
                <tr>
                    <td>
                        <?php
                            echo $staff["first_name"];
                            }
                        ?>
                    </td>

                    <?php 
                        $staff_set = find_all_employee();
                        while ($staff = mysqli_fetch_assoc($staff_set)) {
                            //display staff last name
                    ?>
                    <td>
                        <?php
                            echo $staff["last_name"];
                            }
                        ?>
                    </td>

                    <?php 
                        $staff_set = find_all_employee();
                        while ($staff = mysqli_fetch_assoc($staff_set)) {
                            //display staff department
                    ?>
                    <td>
                        <?php
                            echo $staff["department"];
                            }
                        ?>
                    </td>

                    <td>
                        <a href="edit_admin.php"><span class="glyphicon glyphicon-pencil"> Edit</span></a> 
                        &nbsp 
                        <a href=""><span class="glyphicon glyphicon-trash"> Delete</span></a>
                    </td>
                </tr>

            </tbody>
        </table>
    </div>

Here is the function that am using to find the list of all employee from the my staff table

function find_all_employee() {
    global $connection;

    $query  = "select * from staff";
    $staff_set = mysqli_query($connection, $query);
    confirm_query($staff_set);
    return $staff_set;
}

Is there a better way to write the loop and display my data in the right way? I have looked up similar threads but still not able to grasp.