Either LR has already imported those photos but it thinks they are in a different folder—you can search the All Photos collection by filename to try to find them, or some of the photos are JPGs with the same base filename as a raw file in the folder so the JPGs are considered sidecars of the raws and wouldn’t both show up as separate photos in LR. There is a setting in LR preferences to treat JPGs and RAWs separately and if you enable this then you can synchronize the folder and see the JPGs as well as their corresponding raw files.
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