are your recordings stretched like in those screenshots?
I have the GoPro Hero 4 Black with 5.0 firmware and NTSC and none of your issues. if your recordings are normal, then it looks like a smartphone issue. rebooting everything didn't fix things (the phone, the gopro and the controller)?
as for field of view (FOV), the GoPro lens is a fisheye lens. So center will be the least distorted and as you go toward the outer edge of the lens, it will get more distorted. So wide is the full lens and thus the greatest field of view but the most distortion as you go toward the periphery of the image. Medium merely crops away the outer parts of the lens (so it basically throws away the most distorted part) so it looks more normal. That why the view looks more "zoomed in". Narrow crops even more so you're only getting the most middle part of the lens which is the least distorting. And thus it looks super zoomed in. But narrow will look the most normal and most approximate to traditional lenses.
I have the GoPro Hero 4 Black with 5.0 firmware and NTSC and none of your issues. if your recordings are normal, then it looks like a smartphone issue. rebooting everything didn't fix things (the phone, the gopro and the controller)?
as for field of view (FOV), the GoPro lens is a fisheye lens. So center will be the least distorted and as you go toward the outer edge of the lens, it will get more distorted. So wide is the full lens and thus the greatest field of view but the most distortion as you go toward the periphery of the image. Medium merely crops away the outer parts of the lens (so it basically throws away the most distorted part) so it looks more normal. That why the view looks more "zoomed in". Narrow crops even more so you're only getting the most middle part of the lens which is the least distorting. And thus it looks super zoomed in. But narrow will look the most normal and most approximate to traditional lenses.