Hello @tomo55555,
Sorry for the experience you had with our plugin.
Can you please confirm if you are using a page builder to create the posts and pages? Your theme or page builder should be compatible with our plugin for content analysis to show accurate results. You can check all the compatible themes and page builders here: https://rankmath.com/compatibility/
And even if your page builder is not compatible, only the content analysis will be affected. All other features that are much more important than the SEO score for the on-page SEO of the site will work fine.
Please stay advised that these tests are just guidelines, and one does not need to follow them religiously.
At the end of the day, the content needs to be written for the readers and not for the search engines.
Scoring higher points in Rank Math’s tests won’t guarantee higher rankings.
Looking forward to helping you.