Board Thread:Support Requests - Designing Your Wiki/@comment-1264853-20180829145055/@comment-1038387-20180829155958

That's because the table on Template:Cast is not closed. It needs a closing |}. Because it's not closed, it includes the second template in the code and uses that template's closing brackets as its own.

Closing brackets are the bane of the Internet.

Sidenote: The template on the bottom of Freddie Highmore is the navbox called Crew2. "Crew" is an infobox. I'd really recommend more sensible naming, like including Infobox and/or nav in the template name.