For other 'Users' of LrC in this forum to be able to help-
Please explain in more detail what you mean by- "my LR Classic catalogue producing multiples".
I shoot with Nikon gear and do not experience "ghost/holes in the cataloguing system"- explain!
Please include the following in your post: Adobe product and Version number- A Screenshot of the info panel from MENU: Help/System Info... Operating system and Version number The full text of any Error Message(s) Screenshots of the problem, or detailed explanations.
Please post your System Information as Lightroom Classic (LrC) reports it. In LrC click on Help, then System Info, then Copy. Paste that information into a reply. Please present all information from first line down to and including Plug-in Info. Info after Plug-in info can be cut as that is just so much dead space to us non-Techs.