I deleted all forums and topic from my wpForo forum, but yet the Forum Board Statistics is showing that I have 2 forums, 2 topics, and 2 posts. Where is this information coming from? If I open my website I see no forums listed; however, when I click on Recent Posts, I see 2 topics listed. If I click on a listed topic, I get a 505 error. How do I remove these phantom forum, topics, and posts from my database?
Go to Dashboard > Forums > Dashboard And press Clean Up Button, After delete all caches and press CTRL +F5 twice in your browser page.
Also, if you have cache plugin exclude wpForo from the cache plugin, check the link below for more info about cache: