Not recognizing H1 headings

[NegarKaviani]

Although I'm using H1 headings , in Seo Site Checkup headings are not recognized. Is it necessary to buy yoast premium making Seo Site Checkup recognize these headings?

• Platform: WordPress | Drupal | Standalone
• Platform version:
• Yoast SEO version:

Which browser is affected (or browsers):

• [ ] Chrome
• [ ] Firefox
• [ ] Safari
• [ ] Other