alarm_webmaster on "[Theme: Tiga] h1 tag on homepage"

Hi
your theme is really pro, but is there any problem with h1 tag on homepage?
It does not show here http://collectifanimalier06.org (see source code)
I'am using child theme, but I did not modify header.php and tiga_site_title() function...
As you know, it is needed by search engines.
Thanks in advance for your help