Knew that you u checked it by setting up your new site and it has no duplicate graviter image. But in your first site, we like to recommend you to check if there are any lazy load plugins or any other plugins that caused replication of author image. Try deactivating plugins and check the author box.
Option for turn on/off author box is available in color blog premium version or if you like to have it you can ask through customization https://mysterythemes.com/customization/.
Let us know if issue is not solved.