Some of the comments posted by visitors are incorrectly attributed on the frontend to my (admin) username.
I’m guessing this might be because I had to edit some of them.
The backend (admin) shows the correct author names, but I can find no way to make them display correctly on the frontend.
Following instructions given when I asked this question at https://wordpress.org/support/ I deactivated and deleted the previous version and overwrote it with the Beta version.
When I first looked at the comments page, all the correct authors were showing, but of course the style was messed up.
I then carried out the 3 step setup process from Admin and regenerated data etc.
The display of comments is fine now, but unfortunately it’s showing the admin author again, in place of the commenting authors.
I was asked to pursue the issue here. Thanks.