Lightroom Classic 9.2.1 doesn't recognize existing photos while importing on macOS 10.14.5

[cristianosound]

Hi, I'm using Lightroom Classic 9.2.1 on a Mac OSX 10.14.5. When I import photos from the camera or the card reader or the iPhone, the software doesn't keep straight the new photos from the ones that have already been imported. The "New Photo" option is flagged and I only have one catalogue. however the software imports all the photos, includede the ones already existing in the catalogue. It's not a new issue, it's been happening for months now and if I remember well probably also with previous Lightroom releases. Does anybody can help?

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[nikunj.m]

Hi there, we are sorry about the experience with Lightroom Classic. Could you please confirm if the option "Don't import suspected duplicates" is checked in the import window under File Handling?

Regards,

Nikunj