[DigitalEl]

Nearly every time I open Photos on OS X, old photos are showing up mixed in with pics I snapped just last week. My daughter is 13. Her newborn baby pictures are right there with pics from her brother's 12th birthday party from 2 weeks ago. These aren't the original pictures, out of order. They're duplicates being created for some reason.

I'll delete these duplicates, then a day or two later, others show up... Always older pics, mixed in with new ones. This propagates to all my iCloud-synced iDevices, too, of course.

Additionally, whenever I plug my iPhone 6s into my Mac, a bunch of old (sometimes years old) pics show up under iPhone 6s in Photos > Import. I'll import all 250-or so, then carefully drag them all to the trash (because they are duplicates). The next time I plug my phone in, they're back.

Any ideas?

[andi*pandi]

cleanup the photo library? maybe the dates got wrong. In iphoto if you held down option as you launched, it would show a menu for repairing.

[Curiosity]

That is what I dislike about iPhoto. It wants to keep everything it ever viewed. It is fine for enhancing images, but I do not like it as a viewer, and I remove every image it has stored once I am through with enhancing and saving them to the normal disk system.