Board Thread:General Discussion/@comment-24348070-20141002013145/@comment-24773467-20141026105047

Given that both the examples include 25 discussions per page, there most definitely is a second one. Otherwise this is an extreme coincidence, but I highly doubt it. This also wouldn't explain why certain pages do/don't have secondary additions.

Staff confirmed it was a bug, either way, and are working on a fix at the moment.