I've just started getting an issue with LR Classic where it thinks there are 2 copies of each file on my memory card. I've just spent a madeningly frustating hour on the phone to Adobe Support and didn't get anywhere.
My workflow is to create a new catalogue for each project. Insert the CF card fresh from my camera and import the images directy from memory card to an external USB drive. The images have not previously been imported to this or any other catalogue. Mac finder shows only one copy of each file on the memory card as does Capture One.
I know I can click the 'do not import suspected duplicates button' but it's still annoying nonetheless.
Can you provide the version NUMBER of your Lightroom Classic? Can you provide the version NUMBER of your operating system? We need the version NUMBERs and not words like "latest" or "up-to-date".
I seem to recall a recent thread with the same problem, but I do not remember if a solution was found, so I leave it to you to search for it.
LR Classic 10.2
Mac Catalina 10.5.7
I saw the same thread before posting here but couldn't see a solution.
Since no one has replied in 3 days, I think that gives you the answer ... we don't know.
Glad that exact version NUMBERS helped then. 😉