User blog comment:Kirkburn/Technical Update: May 18, 2015/@comment-452-20150519133030

The "Recent Wiki Activity" sidebar currently says that Kirkburn left a reply 5 minutes ago, but when I click it, I only see 3 comments.

After leaving my comment, the counter updated to 7 comments and Kirkburn's 3 comments appeared.

So apparently this was a caching issue, but I've never seen this occur with blog comments before.