Board Thread:Support Requests - Getting Technical/@comment-30509676-20180908235032/@comment-1038387-20180909190430

Yes... because you added the tmnt-extreme to the template.

Now it registers the wiki as tmnt-extreme plus whatever you added in the interwiki parameter. You can easily see that in the url you linked above.

The template does not need a reference to tmnt-extreme - it would break every use of the interwiki field on the wiki. The interwiki parameter on that particular episode's infobox needs to be fixed to tmnt-extreme.