I recently imported photos to LR CC from a memory card on an Apple laptop and was surprised to find that the photos also appeared in iPhoto. I did not intend this and did nothing to cause it! Why did this happen and can it be prevented?
Sorry to know about the undesirable images getting added to iPhoto after you've added images to Lightroom CC from your memory card.
Could you please let us know the exact version of Lightroom you're using and the operating system you're working on?
Yes, thanks Akash: It's Mac OS 10.11.5 and Lightroom CC 2015.12, camera raw 9.12.
Could you please update to the latest version of Lightroom i.e Lightroom Classic CC 7.5 and let us know if that helps? Refer http://blogs.adobe.com/lightroomjournal/2013/06/keeping-lightroom-up-to-date.html