Lead Qualified for the Smart Campaign Unexpectedly

Issue

A lead qualified for a Smart Campaign even though they do not meet the Smart Campaign filter requirements.

Solution

At the time the campaign ran, the Smart List was configured differently, which made the lead qualify at that time. The Smart List of the campaign was then changed after the campaign ran.

Users with admin permission can check this using the Audit trail

https://docs.marketo.com/display/public/DOCS/Change+Details+in+Audit+Trail#ChangeDetailsinAuditTrail...