“run through Filebot” doesan’t mean anything unless you specify which naming pattern you told Filebot to use.
Please tell how these files are named and if they are in a folder and how this folder is named.
Keep also in mind that if you add files into Plex first, and only afterwards correct their file names with Filebot, they sometimes are still not recognised correctly.
In these cases you need to Plex Dance the affected items.