Shop isle h1 header

So, on my actual site, the title of the page is under h1. (blog.contexttravel.com).
I created another staging site to test the shop isle theme but the problem I’m facing is that the actual title is under h2 and this is what I get under h1 – <h1 class=”site-title”></h1>

Under h2:

<h2 class=”post-title”>
Traveling the Depths of Favelas and Soccer in Rio de Janeiro
</h2>
I want the title of the page to be under h1 and not h2.

Thanks