Guest author not showing in Author Box

Hi, we are trying to use the guest author feature of co author plus plugin. When a user submits a form that form is published as a post. The post screenshot is attached below.

The guest author’s name is not showing in the author box, instead, it’s showing the publisher’s name.

Here is the screenshot: https://prnt.sc/0jazJvGqptFq

The page I need help with: [log in to see the link]