This has happened before, and I reported it. But now another person or possibly the same person is confirming roles that have not been confirmed on the Hercules story. Here is the link: https://www.mycast.io/stories/hercules
From what I've seen after looking at the story, these seem to be multiple people and not a single person who want to "confirm" their fake suggestions. If you want them unconfirmed, you could contact the creator of the story, but if he's inactive, I suggest creating your own and unconfirming any false confirmations and blocking anyone who does them.
Join myCast
Do you love movies? Fan casting? myCast is the place for you!
Join thousands of other users in fan casting your favorite stories. Take 30 seconds to create a completely free profile, which will allow you to: