When I make changes to a photo on the iPhone (or iPad), I see those changes in Photos on the Mac, but the sliders are all in the center position (so if I hadn't made a change to the photo).
But I can see the change on the photo itself, I can switch between the original and the changed photo by pressing the "M" key and I also have the option "Back to original".
However, when I make changes to a photo in Photos on the Mac, I also see the changes to the photo on the iPhone (and iPad), but the "sliders" for the changes are not set to zero like on the Mac, but show the same values as I did on the Mac.
Can anyone confirm that, or is it just me?
PS: Use iCloud for synchronization