[IamDan]

As klojum has mentioned I might get the skin refresh as a startup task to see if this reolves it .

A skin refresh at a startup of a Kodi client is a bit nonsense, as everything gets refreshed already.
I mean using a keymapped like F5 so you can refresh a Kodi skin at any time.

Im running mariadb 10.3.21 on my Synology 1513+.

That version should be just fine.

NOTICE: ADDON: skin.estuary.modv2 v3.0.5 installed
That skin comes with plenty of "extra functionality" from what I remember. Maybe it is a bit disruptive of normal Kodi proceedings. Try switching to the default Estuary skin, and restart Kodi.

ERROR: Failed to close(volume1/video/TV Shows/Hitler's Last Year/poster.jpg) - close call failed with "NFS: Commit failed with NFS3ERR_ACCES(-13)"
This should be harmless and only on a file handling level, and not affect Kodi's database handling.

I switched back to estuary. Im now getting In progress items being added from my pi running libreelec however my windows machine will not update. Even when I play something on the windows machine it wont update the in progress list.

EDIT: OK I thinkits all working now. As soon as I completed a full episode it all sprang into life (weird). I really appreciate the help!! Ill start adding the advancedsettings etc to other clients and see how i go! Thanks again