shadow traces on the spotlights

I have a rendering problem, when I make a camera movement in my scene, and there is an object between the camera and the background spotlight, it appears a black trace that takes the shape of the object in question on the movie render queue…

on the right red spotlight you can see the tracks at the beginning and also on the white spotlight when the screen passes in front…

I really tried to figure out by myself what the problem was by trying a lot of different settings, volumetric, spotlight but I can’t find where it comes from.
i noticed that the traces are less present but still existing when i render with 1 spacial sample count

Capture d’écran 2021-08-15 132138