Board Thread:General Discussion/@comment-37720492-20190409041837/@comment-9605025-20190413230544

If I recall correctly, ever since Wikia introduced template types, wikis are required to categorize their templates. Old templates are temporarily placed in "Unknown" and the editing user is required to categorize it during the next edit session. You can always just select "Unknown" as the category (it is at the bottom). Note that the publish button at the bottom of the pop-up will be grayed-out until you make a selection.

The fact that you can't get to the bottom would appear to be some incompatibility with your browser. You should be able to scroll to the bottom.