When you delete the last item in a label batch, it effectively deletes the batch, but leaves you with an add form which still retains the batch_id. That means that if someone else creates a new batch before you add another item to "your" empty list, their batch will take that same batch_id, and when you add your item you will add it to their list. Steps to reproduce: 1. Cataloging - Label creator - New label batch 2. Add any item to the batch 3. In the list of items in the batch, click delete 4. Different browser, log in as a user at a different branch 5. Cataloging - Label creator - New label batch 6. Add any item to the batch 7. Back to the original browser, add any item to the "empty" batch 8. You now have a batch with two items in it when you only added one 9. Try to solve your confusion by going to Manage - label batches, maybe you added it to the wrong batch? Wups, no, there are no batches to manage, because now that batch you added an item to is owned by a different branch and you can't manage it to remove your accidental add.