i noticed this a while back, but i haven't had time to report it until now. seems like after an update to the UI.X Dark theme by themehouse, the XFA extended cover addon is appearing strangely on user profiles:
the cover is going across the page so the avatar is appearing below instead of...
XenForo > 1.4.x
An Identicon is an avatar that corresponds to a unique hash of data. For more information, visit the Wikipedia page.
Once this add-on is installed on your forum, your users will be able to select to use as avatar an automatically generated Identicon...