wp-login.php?redirect_to=https problem

Add the below code into your functions.php file

function redirect_login_page()
{
    $login_page = home_url('/login/'); //your redirect page link here
    $page_viewed = basename($_SERVER['REQUEST_URI']);

    if ($page_viewed == "wp-login.php" && $_SERVER['REQUEST_METHOD'] == 'GET') {
        wp_redirect($login_page);
        exit;
    }
}
add_action('init', 'redirect_login_page');