Some contents are locked after an edition of these ones without an action to lock them.
This is a known Bug fixed in Jahia 6.6.2.11.
Here is the link to our documentation: https://www.jahia.com/customer-extranet/jahia-xcm-version-66/changelog/changelog-from-jahia-v66210-to-jahia-v66211
Here are the details: Avoid corrupted locks without tokens when save fails.