I have a tag, let’s say
utk, and then I rename it to
UTK. When I want to tag a post to this tag, I found duplicate choices in the filter. Both version exist. But on the tags page, there is only one version, which is
UTK. And I can use either one of them to tag a post and tag filter can successfully filter the post.
How can I get rid of the
utk and only keep the