itunes not syncing all photos from Mac to iPhone 6
I'm trying to sync photos from my Mac, through iTunes, to my iPhone 6. It has always worked until recently. Now it only syncs some photos in each new folder, but not all photos in the folder. I have tried the setting for all photos in the library as well as select folders - same result. I tried deselecting the folder, syncing (which removed the entire folder), and then reselecting and syncing (which added only the same photos but not all). All photos are the same file type (.jpg). I have tried syncing multiple times with the same results. I am not using iPhoto but am syncing through iTunes. iPhone is running iOS 8.1.1 and Mac is running OSX 10.9.5. Any help is appreciated.
iPhone 6, iOS 8.1.1