PHP Problem with verifcation code

Hello,

I have a question. I'm facing a problem with an incorrect verification code. A six-digit code is randomly generated and inserted into my database after entering an existing email in the form of forgot password to submit email. Then a new code is sent to the database. When I enter this code in the verification form, it consistently says 'incorrect code.' I would appreciate it if anyone could help me a bit with it. Thank you :)

<?php
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

// Database connection parameters
$host = "localhost";
$username_db = "root";
$password_db = ""; 
$database = "stroox";

$conn = new mysqli($host, $username_db, $password_db, $database);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $verification_code = $_POST["verification_code"];
    $new_password = $_POST["new_password"];
    $confirm_password = $_POST["confirm_password"];

    // Check if passwords match
    if ($new_password !== $confirm_password) {
        echo "Passwords do not match. Please try again.";
        exit; // Stop execution if passwords don't match
    }

    // Verify the verification code
    $checkCodeSql = "SELECT email FROM reset_tokens WHERE code = ? AND is_received = TRUE AND TIMESTAMPDIFF(MINUTE, received_at, NOW()) <= expiration_time";
    $stmtCheckCode = $conn->prepare($checkCodeSql);
    $stmtCheckCode->bind_param("s", $verification_code);
    $stmtCheckCode->execute();
    $resultCheckCode = $stmtCheckCode->get_result();

    if ($resultCheckCode->num_rows > 0) {
        $row = $resultCheckCode->fetch_assoc();
        $email = $row["email"];

        // Update the password in the users table
        $updatePasswordSql = "UPDATE users SET password = ? WHERE email = ?";
        $stmtUpdatePassword = $conn->prepare($updatePasswordSql);
        $hashed_password = password_hash($new_password, PASSWORD_DEFAULT);
        $stmtUpdatePassword->bind_param("ss", $hashed_password, $email);
        $stmtUpdatePassword->execute();
        $stmtUpdatePassword->close();

        // Remove the used verification code
        $deleteCodeSql = "DELETE FROM reset_tokens WHERE code = ?";
        $stmtDeleteCode = $conn->prepare($deleteCodeSql);
        $stmtDeleteCode->bind_param("s", $verification_code);
        $stmtDeleteCode->execute();
        $stmtDeleteCode->close();

        echo "Password reset successful!";
    } else {
        echo "Invalid or expired verification code. Please try again.";
    }

    $stmtCheckCode->close();
}

$conn->close();
?>

    <div class="container">
        <h2>Reset Password</h2>
        <form action="reset_password.php" method="post">
            <label for="verification_code">Enter Verification Code:</label>
            <input type="text" id="verification_code" name="verification_code" required>
    
            <label for="new_password">Enter New Password:</label>
            <input type="password" id="new_password" name="new_password" required>
    
            <label for="confirm_password">Confirm New Password:</label>
            <input type="password" id="confirm_password" name="confirm_password" required>
    
            <button type="submit">Reset Password</button>
        </form>