Shopping Cart Question with Cookies!

I'm passing cookies from one page to another.  Then I'm taking the value of a drop down menu (for quantity) the Price (a cookie) and doing the math to get the total.  My submit buttons will calculate and print the total into a <td>. 

My issue is when I have two items once I click submit it will remove the value of the one and calculate and print the other.

Any help would be greatly appreciated!

                global $tax;
                $tax = .06;
                
                if (isset($_COOKIE['shoe1'])) {
                    print "<tr><td>";

                    print "<img src=\"Images/1.jpg\" width=\"100px\" height=\"75px\">";

                    print "</td><td>";

                        echo $_COOKIE['shoe1']['Description'];

                    print "</td><td>";

                        echo $_COOKIE['shoe1']['Item#'];

                    print "</td><td>";

                        echo "$" . $_COOKIE['shoe1']['Price'];

                    print "</td><td>
                    
                        <form action=\"cart.php\" method=\"POST\">
                            <select name=\"dropdown1\" id=\"dropdown1\">
                                <option value=\"1\">1</option>
                                <option value=\"2\">2</option>
                                <option value=\"3\">3</option>
                                <option value=\"4\">4</option>
                            </select>";
                            print "<input type=\"submit\" name=\"Calculate\" value=\"Calculate\">
                            
                        </form></td>
                        
                    <td style=\"align:center;\" width=\"100px\">";
                    
                    $amount = $_POST['dropdown1'];
                    
                    $price = $_COOKIE['shoe1']['Price'];
                    
                    $total = $price * $amount + $tax;
//                     
                    echo $total;
                    
                    
                    print "</td></tr>";

                }

                if (isset($_COOKIE['shoe2'])) {
                    print "<tr><td>";

                    print "<img src=\"Images/2.jpg\" width=\"100px\" height=\"75px\">";

                    print "</td><td>";

                        echo $_COOKIE['shoe2']['Description'];

                    print "</td><td>";

                        echo $_COOKIE['shoe2']['Item#'];

                    print "</td><td>";

                        echo "$" . $_COOKIE['shoe2']['Price'];

                    print "</td><td>
                    
                        <form action=\"cart.php\" method=\"POST\">
                            <select name=\"dropdown2\" id=\"dropdown2\">
                                <option value=\"1\">1</option>
                                <option value=\"2\">2</option>
                                <option value=\"3\">3</option>
                                <option value=\"4\">4</option>
                            </select>";
                    print "<input type=\"submit\" name=\"Calculate\" value=\"Calculate\">
                            
                        </form></td>
                        
                    <td style=\"align:center;\" width=\"100px\">";

                    $amount = $_POST['dropdown2'];

                    $price = $_COOKIE['shoe2']['Price'];

                    $total = $price * $amount + $tax;

                    echo $total;

                    print "</td></tr>";

                }