Plex App not reflecting Plex folder structure on Synology DS413J NAS

Hi

I run the Plex app via Windows 10 and using a Synology DS413J NAS.

I’ve created a file structure a while ago and then deleted without a problem. I’ve subsequently re-added the files in to a new library and here’s where it gets interesting…

The new files appear in the correct library structure when logging on with Windows in to Plex. When I log in via the IOS app, I see the old file structure with the new files…

I’ve also shared some of the folders with a friend, but despite me only selecting a few, they can see all of the folders, including the old folder structure with the new files in it. I hope you’re following…

I’ve tried re-installing the apps on the server, and on Windows. Still the same thing happens.

Any ideas?