Frustrated ex-kodi user with episodes/seasons not showing up.

Yes, As I first posted, removing the - is the answer here.

@ChuckPA said:
Look at your Sxx-Exx. This is incorrect. SxxExx (no punctuation or spaces)

It may be necessary to move Season 5 to some place PMS doesn’t monitor, Scan the library, Empty the Trash, Clean bundles, and then move back (the Plex Dance) to get it recognized properly again.