How could I fix this Auto Increment?

Question

So, here is my problem on login through steam id it creates an account on my website but it also decides on next login to skip an Auto Increment causing the next registered member to gain a ton of Auto Incremented member id's

<?php
require ("common.php");

class SteamSignIn
{
const STEAM_LOGIN = 'https://steamcommunity.com/openid/login';

public static function genUrl($returnTo = false, $useAmp = true)
{
    $returnTo = (!$returnTo) ? (!empty($_SERVER['HTTPS']) ? 'https' : 'http') .  '://' . $_SERVER['HTTP_HOST'] . $_SERVER['SCRIPT_NAME'] : $returnTo;

    $params = array(
        'openid.ns'         => 'http://specs.openid.net/auth/2.0',
        'openid.mode'       => 'checkid_setup',
        'openid.return_to'  => $returnTo,
        'openid.realm'      => (!empty($_SERVER['HTTPS']) ? 'https' : 'http') . '://' . $_SERVER['HTTP_HOST'],
        'openid.identity'   => 'http://specs.openid.net/auth/2.0/identifier_select',
        'openid.claimed_id' => 'http://specs.openid.net/auth/2.0/identifier_select',
    );

    $sep = ($useAmp) ? '&amp;' : '&';
    return self::STEAM_LOGIN . '?' . http_build_query($params, '', $sep);
}

public static function validate()
{
    $params = array(
        'openid.assoc_handle'   => $_GET['openid_assoc_handle'],
        'openid.signed'         => $_GET['openid_signed'],
        'openid.sig'            => $_GET['openid_sig'],
        'openid.ns'             => 'http://specs.openid.net/auth/2.0',
    );

    $signed = explode(',', $_GET['openid_signed']);
    foreach($signed as $item)
    {
        $val = $_GET['openid_' . str_replace('.', '_', $item)];
        $params['openid.' . $item] = get_magic_quotes_gpc() ? stripslashes($val) : $val; 
    }

    $params['openid.mode'] = 'check_authentication';

    $data =  http_build_query($params);
    $context = stream_context_create(array(
        'http' => array(
            'method'  => 'POST',
            'header'  => 
                "Accept-language: en\r\n".
                "Content-type: application/x-www-form-urlencoded\r\n" .
                "Content-Length: " . strlen($data) . "\r\n",
            'content' => $data,
        ),
    ));

    $result = file_get_contents(self::STEAM_LOGIN, false, $context);


    preg_match("#^http://steamcommunity.com/openid/id/([0-9]{17,25})#", $_GET['openid_claimed_id'], $matches);
    $steamID64 = is_numeric($matches[1]) ? $matches[1] : 0;

    return preg_match("#is_valid\s*:\s*true#i", $result) == 1 ? $steamID64 : '';
}
}

$steam_login_verify = SteamSignIn::validate();
if(!empty($steam_login_verify))
{
// Grab Data From Steam API
    $json = file_get_contents('http://api.steampowered.com/ISteamUser/GetPlayerSummaries/v0002/?key=' .  $sapik . '&steamids='. $steam_login_verify .'&format=json');
//Decode Data From Steam API
    $data = json_decode($json);
foreach($data->response->players as $player)
{
    $query = "INSERT INTO steam (steamid, personaname, profileurl, avatar, avatarmedium, avatarfull ) VALUES ( :steamid, :personaname, :profileurl, :avatar,   :avatarmedium, :avatarfull) "; 
    $query_params = array( 
        ':steamid' => $player->steamid, 
        ':personaname' => $player->personaname, 
        ':profileurl' => $player->profileurl, 
        ':avatar' => $player->avatar, 
        ':avatarmedium' => $player->avatarmedium, 
        ':avatarfull' => $player->avatarfull, 
        );

}

                try 
    { 
        $stmt = $db->prepare($query); 
        $result = $stmt->execute($query_params); 
    } 
    catch(PDOException $ex) 
    { 
    switch( $ex->errorInfo[1] )
 {
     case 1062:
        $ps = $db->prepare("SELECT * FROM `steam` WHERE steamid = :sid");
        $ps->bindParam(':sid', $steam_login_verify);
        $ps->execute();
        $ps->setFetchMode(PDO::FETCH_ASSOC);
        foreach ($ps as $row)
            {
                $_SESSION['sid'] = $row['steamid'];
            }

            header('Location:'.$basedir);
            die('redirecting to'.$basedir);
        ;

}
    }
    $ps = $db->prepare("SELECT * FROM `steam` WHERE steamid = :sid");
    $ps->bindParam(':sid', $steam_login_verify);
    $ps->execute();
    $ps->setFetchMode(PDO::FETCH_ASSOC);
    foreach ($ps as $row)
    {
        $_SESSION['sid'] = $row['steamid'];
    }

    header('Location:'.$basedir);
    die('redirecting to'.$basedir);
} else { 

$steam_sign_in_url = SteamSignIn::genUrl();
}