The problem is likely (not sure from your description) that you still have leads coming out of a wait step and getting the email from the next flow step. It's tough to stop this. You can: delete the 'send email' flow step that is still sending the emails, or disapprove the email altogether if it won't impact another campaign, or find all the leads in the wait step and run a remove from flow action on them for that campaign.
Or, of course, none of those and it's a different problem entirely...