I think it might score that based on a subhead having markup like <h3> vs <strong> … but have not yet tested that theory 🙂
I noticed this too, then forgot about it, as sometimes a bold subhead works just fine for me for stuff like “About Company ZYX:”.
In my case simpler to import some stuff with the bold/strong there from MS word vs manually changing them all to <h3> tags. Ugh.
I suppose technically a bolded sub-head isn’t really a ‘heaader’ without the semantic h tag markup for h2 or h3.
Try it with h2 for a main subhead, and h3 for supplemental subheads. What happens then?
@neotrope is correct. The plugin looks for a subheading format, such as H2 or H3. If you’re not sure how to add a subheading, please see this article: Warning: You have not used your focus keyword in any subheading
