I find it interesting to note (as I did in my previous posts somewhere) that of all the ‘TV Shows’ that I have, only the Blu-Ray content is having this problem (Firefly, Sherlock, Star Trek). They show up just the same after adding the year to the folder: i.e. Firefly (2002) Sherlock (2010) Star Trek (1966)
Here is a .png of Sherlock after the “Plex Dance”, and the result is the same when I delete the Library and re-add it back in.