Post Navigation in H1 tag

Hi there,

At the moment im setting up the theme for my blog site. When loading up a post in a seo tool then I get the message that there are multiple H1 tags. One of them is the post title and the other one is the tag containing Post Navigation.

What is this post Navigation and is it possible to move this to the H4 tag? It seems that the other blog structure tags are here as well and H4 would be fine for me.

Thanks

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