I noticed that after the latest update they had both set to camera settings instead of the original Gimbal down/up and gimbal mode. I also found when changing them I had to set them up twice, but I think in between the first time and the second time I went in to the screen with the Phantom 3 off, and I wondered if the app resets them in that situation as it cannot read the setting from the Phantom 3 so reverts to some default, but when the Phantom 3 is powered back on the app overwrites the Phantom 3 with these defaults.
Hope that makes sense. But anyway, after the second attempt they have retained the settings I need.