Okay, it looks like a forum bug … of using a different style for smaller browsers. I discovered this when I resized the laptop browse slightly smaller for more open screen area. The problem is the forum code thinks my new size is cell phone sized, and hence the different, larger-everything format. A fix would be to ID the device. Or, rather than use browser size, use the desktop size (might still be a problem if a phone has native high resolution).
Isn’t this how it’s supposed to be? As far as I know, this should be a quick fix for the migration, so it works well on mobile, and for the update computers are adressed. So this wouldn’t be a bug, it would be simply a missing feature.