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Is this a purposeful bias or a glitch?
Whatever it is, it’s coming from your own site and/or computer 😀
That means that when you first entered the tag, it was with a lower case t.
WordPress will remember the case of the first time you use a tag and retain that going forward.
For example, if the first time you use a tag about books is “Books” and the first time you use a tag about movies is “movies,” then the tags will be “Books” and “movies” going forward.