And log from Mailgun that email went to registered members.
Could you please switch to 2022 them in wpForo > Themes admin page?
Go to wpForo > Overview admin page, scroll down and click the [Delete All Caches] button.
Also, please leave a URL to your forum where we can register and see the subscription options in our subscriptions tab.
I decided that instead of troubleshooting an old version of wpForo and my staging site with the upgrade did not seem to have the same issue, that I would upgrade my live site to V2.
I am happy to say that with some testing and using an email log in sandbox mode, the unauthorized emails are not being sent in V2.
Thanks for your help, and I would say that if anyone else is experiencing the same issue, to upgrade to V2.