我的Mysql查询没有比较值

我有一段写的代码

$stmt = $mysqli->prepare("INSERT INTO `verifyAccounts` (`CUsername`, `CPassword`) VALUES (?,?)");
$stmt->bind_param("ss", $CUsername, $CPassword);
$stmt->execute();
$stmt = $mysqli->prepare("SELECT `Started` FROM `verifyAccounts` WHERE `CUsername` = ?");
do {
    $stmt->bind_param("s", $CUsername);
    $stmt->execute();
    $stmt->bind_result($Startedvalue);
    echo $Startedvalue;
    sleep(2);
} while ($Startedvalue < 2);
if ($Startedvalue == 2) {
    echo "Correct";
} elseif ($Startedvalue == 3) {
    echo "Incorrect";
}
$stmt = $mysqli->prepare("DELETE FROM `verifyAccounts` WHERE `CUsername` = ?");
$stmt->bind_param("s", $CUsername);
$stmt->execute();

出于某种原因，这似乎不起作用，我从未收到回复，说"正确"或"不正确"，账户也没有被删除。它似乎被困在Do While循环中，但$Startedvalue也从未得到响应。

这是我有的Ajax

 function verifyAccount(f) {
            f.preventDefault();
            var CUsername = $('#CUsername').val();
            var CPassword = $('#CPassword').val();
            $.ajax({
                type: 'POST',
                data: {
                    CUsername: CUsername,
                    CPassword: CPassword
                },
                url: 'verifyAccount.php',
                success: function(data) {
                    console.log(data);
                    if (data == "Correct") {
                        $("#verifyPasswordText").text('Valid Login');
                    } else if (data == "Incorrect") {
                        $("#verifyPasswordText").text('Invalid Login');
                        $("#verifyPasswordOKC").prop("disabled", false);
                    } else if (data == "CUsername") {
                        $("#verifyPasswordText").text('Fill out your OKC Username');
                        $("#verifyPasswordOKC").prop("disabled", false);
                    } else if (data == "CPassword") {
                        $("#verifyPasswordText").text('Fill out your OKC Password');
                        $("#verifyPasswordOKC").prop("disabled", false);
                    }           
                },
                error: function(xhr, err) {
                    console.log("readyState: " + xhr.readyState + "'nstatus: " + xhr.status);
                    console.log("responseText: " + xhr.responseText);
                }
            });
        }