Videos not appearing in library.

Greetings, I’m not sure if this has been answered before and I just couldn’t find the thread.

I am having a problem with my video library for movies and tv shows.
I have 2 seperate folders in my hard drive that is attached to my network router (TV Shows and Movies) and multiple subfolders in there for the various TV shows and seasons.
I attached those folders to the TV Shows and Movies libraries in Kodi (I had previously just used the “Files” tab to find and watch them) but when I updated the library afterwards not all of the seasons showed up in the library.
For example: I have all of the season of How I Met Your Mother on the hard drive and if I go through the “Files” tab everything is where it is supposed to be, however when I look through the library only season 2,3 and 6 are there.
Any thoughts/fixes on this??

I really appreciate any help you have.