Review what has actually been scheduled for a lead instead of relying only on the reusable campaign setup.
Steps
Open Lead Details > Quick Actions > Manage Campaigns.
Choose the relevant event and campaign.
Review its messages, dates and current statuses.
Open a message when you need to inspect or change that pending item.
Check the actual scheduled-message history after saving a change.
Template versus this lead
A reusable campaign defines future follow-up. A campaign started for a lead has its own scheduled messages. Changing the reusable setup does not prove a particular pending message changed. Sent messages remain history; editing a draft does not recall an email already delivered.
Check replies and duplicates
Review the campaign's stop/pause-on-reply behavior and the lead's recent conversation before resuming or adding messages. Confirm the sender, recipient and send time before taking a send action.