Board Thread:Support Requests - Getting Technical/@comment-26547082-20170223135733

On some wikis today I was monitoring the recent activity and noticed someone had posted a reply to a forum. When I tried to view it the reply wasn't there, and when I posted a reply myself it just went through the animation of posting and disappeared, and isn't in the recent activity.

Any explanations? It does the same thing with messages on message walls, and the messages only appear if you view the entire wall instead of the one thread. 