Deleted posts still appear in the "last post"

[CarlUng]

I had this bot come in and post a thread in every forum. So I deleted all of the threads by that user in the Admin CP but when I come back to the main forum all of the posts still show up in the "Last Post" of the index page.

Can someone assist me with this?
Thanks

[Dismounted]

Could you tell me the steps you took to delete the posts?

[CarlUng]

Well in the Admin CP I searched for the user who made all these threads, selected delete user, then I chose to prune all his posts, then I deleted the user.

Thanks