OpenIDConnectClientException: Unable to determine state

[Jeremiah-Roise]

Hi I'm trying to test this out with keycloak as the provider and running this application with the php development server php -S 8000 -t index.php, the front page loads successfully and when I click authorize it redirects me to the keycloak login page I can successfully login but when I am redirected back the application throws and error and closes.
Here is my config.php.

<?php

// index.php interface configuration
$title = "Generate Tokens";
$img = "https://clickhelp.co/images/feeds/blog/2016.05/keys.jpg";
$scopeInfo = "This service requires the following permissions for your account:";
// Client configuration
$issuer = "http://localhost:1234/auth/realms/testing";
$clientId = "testing";
$clientSecret = "Y36ox283sqBwcf7trVVXBgYgUV5AylB8";  // comment if you are using PKCE
// $pkceCodeChallengeMethod = "S256";   // uncomment to use PKCE
$redirectUrl = "http://localhost:8000/auth.php";
// add scopes as keys and a friendly message of the scope as value
$scopesDefine = array(
//    'openid' => 'log in using your identity',
    'email' => 'read your email address',
    'profile' => 'read your basic profile info',
);
// refreshtoken.php interface configuration
$refreshTokenNote = "NOTE: New refresh tokens expire in 12 months.";
$accessTokenNote = "NOTE: New access tokens expire in 1 hour.";
$manageTokenNote = "You can manage your refresh tokens in the following link: ";
$manageTokens = $issuer . "manage/user/services";
$sessionName = "oidc-client";
$sessionLifetime = 60 * 60;  // must be equal to access token validation time in seconds
$allowIntrospection = false;

$enableActiveTokensTable = false;

and here is my keycloak .wellknown
openid-configuration.txt

Is this issue just because I am using the php development server or have I misconfigured something?