Please keep in mind of what Ruenel said above, you can not nest a headline (h1 - h6), inside a headline element, see what happened to the HTML mark up.
Your hardcoded headline (h2) is outside of the Headline element h tag block (
h2.x-text-content-text-primary), that is why not all settings you have on the headline element is inherited by your hardcoded h2.
And I see you have responsive text applied on your hardcoded h2, that affects the font-size as well, so keep that in mind.
If you really want to hardcode your h2, please use the Content Area element instead, and style your hardcoded h2 with a custom CSS as you like.
You can find the proper CSS code selector using the Chrome browser Developer Toolbar
For the CSS code itself, I suggest that you get started with this tutorial