Using h1 tags in the website title


I’m puzzling that many major theme developer add a h1 tag to their WordPress site title like this:

<h1 class="site-title" itemprop="headline">
<a href="">Example website</a>

Isn’t that bad speaking of SEO? This is at least cause two h1 tags on each page?

Maybe I am completely wrong, but I hope someone with a good SEO knowledge can help me out here :slight_smile: