Odd Webmention Behaviour

I see a bit of odd behaviour with Webmentions, Semantic Linkbacks and WordPress comments. There are five responses in this thread which started with a post from my blog that that was syndicated to micro.blog. Three of the responses show up under the original blog post. However, two show up under my Webmentions collection page.

I am not using the WordPress Webmention for Comments plugin.

It also seems that it's no longer possible to change the Webmention type via Semantic Linkbacks.

Update:

It's not odd behaviour after all.

Added limited support for accepting replies from external sites that do not have a Micro.blog account. Previously, Micro.blog would discard replies that could not be associated with an existing user. Now, these replies will be included in a thread using the domain name for the author. (Brid.gy replies from Twitter are not supported yet.) Manton Reece