Sometimes we have a situation where the edit needs to be rejected but there isn't a good reason for us to pick from.
I do not know who had rejected your edit, but I fixed the title. Thanks for posting about it.
"Information Already on file" can apply to the situation you outline. Also there are times people try to edit the name of something without really changing it. One example is an item without an actual title, like a swag item or something that does not have text on it, or something without standard packaging, a person may change the name to something that is similar to the existing name.
Another case where that response can be used is for when edits to romanized titles are made.