I have noticed for last few months that the Plex rss feed at https://www.plex.tv/blog/feed/ always updates about 30 days too late on Newsblur.
Site settings in Newsblur shows it checks every hour, but I’ve never gotten a post that quickly. Today I received a post from June 27. I don’t have this issue with any site as far as I’ve noticied so I am wondering if a unique problem? It says 742 subscribers, so hopefully someone else can chime in if they have the same problem?