Shadow problem on the spotlights

Hello, I have a problem since a few days when I render images with the movie render queue I have this kind of black trace that appear when an object passes between the camera and the background spotlight
Capture d’écran 2021-08-15 132138

if someone knows what it is already it would help me a lot
here is a render
here is the animated version where you can see the traces from the edge of the screen :