How do you manually reposition faces in Mac OS X Yosemite's Photos App?

I'm not sure if this is a bug or just me missing something out, but when I try to manually add faces in my Photos app (go to photo, 'Get info', 'Add face'), a circle appears where I can name/tag the face. When I go to drag it, however, it will ***not*** let me. I have tried right-clicking and using all of my Ctrl, alt, cmd and shift keys. ***It will not let me drag the circle.*** The only thing I can do is name it, rename it or click the cross to delete it. Again, I'm not sure if this is an actual bug or if I'm doing something wrong. But like this, all I can do is add circles that will pop up in random places of the photo. No clue how to fix this, please help. Thanks in advance!