Previously, users were ordered alphabetically by name in advanced search. The most recent patch list says that users are now ordered by "last action." However, this doesn't seem to be the time of their last action. Does this mean the type of the last action they took? I'm very confused by how they're ordered now, it seems to be at complete random.
Edit: I've figured it out, it seems to be account age. Although I'm not sure why, this doesn't seem to be mentioned in the patch notes and I'm wondering if it's a bug.