This is a bit of a strange one, and one I'll need to look into in a lot more depth. (I've had a cursory look and haven't found the problem, so posting here to see if anyone has encountered similar).
I'm using the example character move actions, and using the correct ismine stuff, and on the whole it works.... however, when player 1 presses a direction, player 2 (across the network, using Photon) will judder and move responding to those key presses. It's only a slight movement, approximate a character width, and then it will snap back to the position is was originally in. The movement is also confined to a small radius.
This also happens when say Player 2 does the same thing.
Any ideas?