Header has been converted into a subheader. While <h3> makes sense in the context of the original site (since title and subtitle are <h1> and <h2> respectively), presenting it as a subheader is ambiguous in the context of an IV since it's supposed to be a first-level header.
I chose "author added their own content" as the reason because it seems that you did this manually: IV engine detects <h3>'s as headers by default. You can make sure it's true by setting nothing else than the article body — https://i.imgur.com/ii6HFxn.png
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I chose "author added their own content" as the reason because it seems that you did this manually: IV engine detects <h3>'s as headers by default. You can make sure it's true by setting nothing else than the article body — https://i.imgur.com/ii6HFxn.png