Hi Agnes,
Check your "EVENT" link at the upper-right on the main page.
Are the problem listings, i.e. those that somehow relisted for no cause, showing on the Events page as "Success" and does the Event Date and Time look correct for a match? If they do, they came from Auctiva and I would open a Support Case, so they can investigate.
Auctiva implemented a new feature yesterday to support auto-Relist, but you technically need to setup a PROFILE to support the feature. That's why Aaron asked. It does merit investigation, as that is a scary possibility for us all.
Danno