That sounds like a plugin or theme conflict. Can you try and gather as much information for us as possible? Please perform the following:
1. Make sure the issue doesn’t persist when Yoast SEO is disabled.
2. Check for conflicts.
3. Check for JavaScript errors with your console.
If you find any JavaScript errors related to Yoast SEO or if there is a conflict with a plugin or a theme, you can create a new GitHub issue for our developers. Please report the issue to a third party developer as well.
If you didn’t find any conflicts or errors, we think the issue is specific to your site. We’d need to investigate further but are unable to do so on these forums. You can purchase Yoast SEO Premium and receive our Premium email support and we can help you further.
1. The problem is with Yoast SEO, so I must keep it enable to count links
2. I searched for conflicts, but now I have a problem:
I deactivated three plugins in a row (Widget Logic, Woosidebars and Tickera – WordPress Event Ticketing) and the problem disappeared. So I reactivated them and I decided to deactivate them one by one, but I couldn’t even try to count the links, because suddently, when I reactivated all the plugins, appeared to me this notification http://www.voicebookradio.com/it/wp-content/uploads/2017/08/screenshot-www.voicebookradio.com-2017-08-11-12-51-20.png
I didn’t follow the steps yet becuase I don’t think that the tables have been erased, because before doing this it counted my links so the tables exist. Maybe is a problem of Yoast.
We suggest you please refer to our this guide to troubleshoot this issue.
I’ll try and I’ll let you know
I wrote to my host and as I thought, the tables already existed. Now the counting of links works, without disabling any plugin
