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It seems that somehow you have more than one character case variant of a tag name.

You should be able to fix this with a management command "fix_question_tags", but you need to know names of tags before

Please, look up usage of this and other commands in the manual.

Before that please do back up the database.

It is not clear just why this happened... There is a filter which prevents creation of tags with the variants of the case.

Also - you could think about turning on "force lowercase tags" setting in the "data entry" section.