That is weird because what I add is the
<a>
tags to the image and that didn’t disturb the DIV layout
It seems like you might delete or add additional DIV while trying to remove the header title that cause the wrapper not to wrap things properly.
Try this for your header.php:
<!DOCTYPE html><!-- HTML 5 -->
<html <?php language_attributes(); ?>>
<head>
<meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php bloginfo('charset'); ?>" />
<link rel="pingback" href="<?php bloginfo('pingback_url'); ?>" />
<title><?php bloginfo('name'); if(is_home() || is_front_page()) { echo ' - '; bloginfo('description'); } else { wp_title(); } ?></title>
<?php if ( is_singular() ) wp_enqueue_script( 'comment-reply' ); ?>
<?php wp_head(); ?>
</head>
<body <?php body_class(); ?>>
<div id="wrapper">
<div id="header">
<?php if( get_header_image() != '' ) : ?>
<div id="custom_header">
<a href="<?php echo home_url(); ?>/">
<img src="<?php echo get_header_image(); ?>" />
</a>
</div>
<?php endif; ?>
<div id="navi">
<?php
// Get Navigation out of Theme Options
wp_nav_menu(array('theme_location' => 'main_navi', 'container' => false, 'menu_id' => 'nav', 'echo' => true, 'fallback_cb' => 'themezee_default_menu', 'before' => '', 'after' => '', 'link_before' => '', 'link_after' => '', 'depth' => 0));
?>
</div>
<div class="clear"></div>
<div id="wrap">
