I'm sure you would like to know what happened Jay and after examining your video carefully, I can see that you have done what I tried to explain in that video of mine you mentioned.
When you clicked the reverse view camera on the minimap you can see that the aim marker is not in view because it is behind the green and out of shot. Then you moved to click the reverse view camera at the bottom of the minimap, but you must have missed it first time and clicked on the screen instead, and because the aim marker isn't actually in view, it moved to where you clicked right by the camera icon. If you stop the video at the 19 second mark you will see the the aim marker moved to where you clicked next to the camera icon at the bottom of the minimap, and that's why it jumped to its new location.
So I guess the moral of this story is, be careful if you move the aim marker so it's out of view on the main screen & thanks for posting the video Jay. : )