Hi guys, I don't know how, but after I last synced my iPhone 6 (running ios 10.2) almost all my pictures in Photos (and photos tab) have been duplicated. I tried to delete some of them by clicking Select but the delete option is greyed out. When I synced I didn't change any settings at all in the Photos app on the Mac. I did make changes to the Music tab of itunes. What have I done wrong? And how can I fix it?