Kodi/TVDB not picking up a few random TV shows

I've recently adopted Kodi on my HTPC and noticed that it hasn't picked up the metadata for a few TV shows:

The Frankenstein Chronicles (2015)
Les Revenants (2012)
Pryde Of The X-Men (1989)
The Spectacular Spider-Man (2008)
Wolverine And The X-Men (2008)
X-Men Evolution (2000)
X-Men: The Animated Series (1992)

I've double-checked the names of the folders, and each has an entry on TVDB. Can anyone figure out what the confusion may be?

Thanks!