WPML compatibility issue

Solved that, not related to this plugin, it is WPML problem.
You can either comment line 9 in inc/browser-redirection.php in WPML, or use a fix (credit to WPML support team):

/*
 * WPML browser redirect fix.
 *
*/
function wpml_browser_redirect_fix(){
        global $sitepress, $post;

        $browser_language_code = substr( $_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2 );
        $active_languages = $sitepress->get_active_languages();

        $reffered = @$_SERVER['HTTP_REFERER'];

        foreach( $active_languages as $language_code => $language ){
                if( $browser_language_code == $language_code && !$reffered ){
                        if ( is_home() || is_front_page() ) {
                                if( $sitepress->get_current_language() != $language_code ){
                                        wp_redirect( $sitepress->convert_url( site_url(), $browser_language_code ) );
                                }
                        } else {
                                if( $post->ID ){
                                        if( $sitepress->get_current_language() != $language_code ){
                                                $post_type = get_post_type( $post->ID );
                                                wp_redirect( get_permalink( icl_object_id( $post->ID, $post_type, true, $language_code ) ) );
                                        }
                                }
                        }
                }
        }
}
add_action( 'wp_head', 'wpml_browser_redirect_fix', 0 );