Looking around the edges of e.g., https://www.mediawiki.org/wiki/Extension_talk:MobileFrontend
users note it is in a different format than a vanilla wiki's Talk pages.
OK, but there is no "branding" at say, the bottom, indicating what is making it different.
I am betting it is DiscussionTools. If so, wouldn't it be best to have some tiny link somewhere, so people could know where to learn more / give feedback?