Thanks for your time @geraltrivia !
You wrote “First of all the issue you’re experiencing with the missing subscribers isn’t occuring because you are using the free version of the MailPoet plugin.”
Our answer : On live site we have premium version and had the same issue.
You wrote “I suggest re-installing the MailPoet plugin on your live site by following this guide:?https://kb.mailpoet.com/article/258-re-installing-updating-the-plugin-via-ftp.”
We observed that the issue maybe came from a save/restore of the web site, mailpoet considered this data migration and delete “old subscribers” to replace them with “new” ones when we update the plugin. New primary keys were created after updating the plugin and the links to newsletter statistics no longer worked.
We “insert to” the old data (and remove the new duplicate data) into the following tables: mailpoet_subscribers.sql, mailpoet_newsletters.sql, mailpoet_newsletter_links.
This is how we recovered our statistics.
A little complicated if “rookies” encounter this issue
We are not sure that reinstalling the plugin would have fixed the issue.
