Board Thread:Support Requests - Getting Technical/@comment-5303512-20180924154526/@comment-27345308-20180924221430

That happens because you've edited many pages that WikiActivity doesn't display, and WikiActivity just fetches last X events from RecentChanges and removes events on certain namespaces/of certain type. That's why mass-deletions can sometimes cause WikiActivity to go blank. It's how WikiActivity works and it's been a known bug since its existence.