Logo doesn't appear on iPad/Tablet in portrait mode

Hi jansthh!

Please try to insert this code at the bottom of functions.php

add_filter('body_class','avia_remove_resize_function');
function avia_remove_resize_function($classes)
{
    $classes[] = 'avia_deactivate_menu_resize';
    return $classes;
}

and check if it fixes the issue.

Regards,
Peter