Hi @Framgeld,
So we can better assist you, please provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.
Using the Andrew Lloyd Webber and The Answer albums as an example, do you see these in your TIDAL favorites in the TIDAL app?
The TIDAL albums in your Roon library are synced with what appears in your TIDAL favorites. If these albums are removed from your TIDAL favorites, they won’t appear in Roon. When you delete these albums, it should be removing them from your TIDAL favorites list, but it sounds like there might be something going on here that is preventing that from happening and then they’re being synced back over.
Can you try removing these albums from your TIDAL favorites from the TIDAL app directly and then sync TIDAL in Roon and let us know if these albums are gone?