Hey @Jayne Whittles3! Unfortunately it's not possible to remove them, but you can duplicate the automation (from the Visual Automations page3, click the 3 dots next to the automation and then click Duplicate). That'll create an exact copy of the automation, but it won't bring over any subscribers into the duplicate, allowing you to delete the original with the incorrect subscribers.
If there are some subscribers that were in the original automation correctly (and who you now need to pull into the duplicate), we have a guide on how you can do that here3.
I hope that helps! :)