Artwork not displaying

So I’ve got a weird issue with a couple of differn’t TV shows. All my TV shows except for 2 list the artwork in the main list.

The Inbetweeners, Parks and Recreation, Southland dont seem to show the artwork is the shows list, however if I go into these shows the Seasons display artwork.

All my other TV shows display the artwork in the main list and for each season.

Naming convention I have is Show Name > Season # > Show.Name.Season.Episode.avi