Difference between camera floating viewport/matinee


something is bugging me; I can’t seem to have the same render when playing the matinee inside the viewport or the floating viewport for the camera.
Once I play the game, it looks like the one in the floating panel.
Why is the main viewport not reflecting the same render?

See b93f6dda08b79a30821bfae18e1db683ce142702.jpeg

Any idea?