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@grupete We’re sorry to hear you are experiencing this issue on your site.

Can you please confirm you are using the most recent version of Yoast SEO, version 15.8? You can learn more about updating here: https://yoast.com/help/how-can-i-update-my-free-plugin/

Also, can you confirm you are using WordPress 5.6.1? You can check by clicking on the W in the top left and selecting About. If you need to update, please check with your host provider. Please know that if you are using an older version of WordPress Core you may experience unexpected behavior with Yoast. This guide explains more: https://yoast.com/why-we-dont-support-old-wordpress-versions/

If you update to the most current version of WordPress and Yoast SEO, does this resolve the issue?

If after ensuring that both WordPress, Yoast SEO, and your other plugins and themes are up to date the issue is still occurring, we’d next recommend performing a conflicting check to see whether another plugin or theme is interfering with the Yoast SEO Plugin. This will help us narrow down the exact cause and determine what the next steps are while saving you time.

The fastest way to do this is to deactivate all non-Yoast plugins and switch to a standard theme like Twenty Nineteen. Test this on your development or staging site, if you have one. If not, we recommend using the Health Check & Troubleshooting plugin. This plugin allows you to run a conflict check without affecting normal visitors to your site.

If you’re unfamiliar with checking for conflicts, we’d like to point you to a step-by-step guide that will walk you through the process: How to check for plugin conflicts.

@grupete

Unfortunately, we’re unable to replicate the error on our test environment with the latest version of Yoast SEO and standard theme. Can you please once again check by fresh installing the v15.8 Yoast SEO plugin? Also, test it with the standard Twenty Twenty-one theme with all non-Yoast plugins deactivated.