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Your Wiki is publicly editable. This is not a default setting.

Please refer to the following to resolve:

On https://help.github.com/articles/about-github-wikis/ you can find the following information:

Wikis can be edited directly on GitHub, or you can work with a text editor offline and simply push your changes. Wikis are collaborative by design. By default, only collaborators on your repository can make changes to wikis, but you can configure this to be enabled for all users on public repositories. Information on how to change this setting can be found here: https://help.github.com/articles/changing-access-permissions-for-wikis/