Hello,
Thank you for contacting Rank Math Support today and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.
I checked and figured out that even though the post was loading fine in Firefox, the content analysis tests of Rank Math weren’t loading. These errors were being logged in the browser’s console:

The issue was caused by a long keyword in your focus keyword field:
come fare selezione del personale con i social network
I changed the keyword and now your post is working fine. We recommend that you try to use smaller focus keywords to prevent issues like this in the future.
The reason for this is because we use a recursive function to detect the presence of the focus keyword on the page and when it’s too long there’s a lot of recursions causing this situation.
This doesn’t prevent any functionality from the plugin, it just hangs the loading time a little more because of this.
We have to use a recursive function there because we need to run through the entire content to find the keywords for our tests to provide insightful information.
Please check and let us know if you need any other assistance.
Thank you.
Very fast! thanks a lot. 🙂
Hello,
We are super happy that we were able to address your concern. If you have any other questions in the future, know that we are here to help you.
If you don’t mind me asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post about your overall experience with Rank Math? We appreciate your time and patience.
If you do have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.
Thank you.