as can be seen in the image, in our forums there are some tags that are exactly the same!
when creating a topic, you will see different number of topics in these tags:
but if you choose one, both will be chosen. but then as you click on the tags, both direct you to the same page with similar topics and topic numbers. so admins can’t merge them or delete one of them.
this is a sample topic in our forum with 2 sets of duplicated tags.