Thanks, I thought it might be something like that because it almost looks like a "slim" version of the message list or something, but it has no attributes added.
Hm, and you can't find that avatar markup at all when you include it in your custom component?
I know there are some custom configs we as mortal devs have no access to, but Khoros support does, so maybe it's such a case (they can basically move around the individual table-cells of one of those message-list items and or add new ones)?
but I'm not entirely sure why that would then not translate to you using the same component elsewhere... so inspect the output and check if everything is the same (can even do a diff to make it easier) in terms of HTML and the only difference are styles. If so, try to recreate the HTML wrapping structure of the original page in your custom component (you have to dig into the CSS to figure out what is basically the "scope" for those native styles).
