I have a movement from the sky to an outside cinema screen. In AE, when I look at each keyframe of the movement, the background of the screen says perfectly within the frame.
But when I render it out, the screen is detached from the cinema screen during the movement and then in place when the camera move is complete.
The screen and the cinema are both at 0 Z space, so I don't understand what is happening. No motion blur. The only thing is that there is mask within the cinema comp so the screen sits nicely within the boundaries.