During Approval circulation for document, the document will be published without approval when Co-author or approver edit the document and push "publish" button.
User can not use Co-author function because of this strange behavior.
PF the attachment for the replication of issue.
Reviewing through your Jive Community custom group I see where you have also filed this issue as a case there. As such I would recommend following up there as this behavior appears to be a bug. Once confirmed, the support engineer assigned to the case can link for reference.