Hi there, not sure if you figured out a response to your problem yet but I came across your post earlier when I was having a similar issue. I’ve just found a resolution so thought I’d track back and help you out!
In your dashboard go to Users on the side menu. When you edit a particular user there is a field named ‘Display name publicly as’ – this controls what combination of the user’s name is displayed on their posts meta data. You should be able to change this to suit your needs.
