Creating camera changes exposure for no reason

Development Rendering
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1

Hello everyone,
my issue is simple to explain yet i can’t figure out any solution or find the source of the issue.
In my scene, when i place a CineCamActor, the whole scene both in the viewport and camera viewport gets overexposed. It doesn’t happend in the others levels i have, i do not have any eye-adaptations in both of my default and cinematic viewports.
See gif below, help is needed asap as i’m reaching deadlines ^^’
Thanks in advance !

5951b7bca4c70f7505806e3db4c36e94

2

So i found a fix but its destructive,
i simply destroyed all the lights in my level since adding a camera in the scene would screw it all up.
Remaking the lighting fixed my issue and adding a camera no longer changes the exposure of the whole level, but i sadly didn’t understand what causes it so my questions is still up, as i want to find a way to avoid it / fix it in the future without having to redo a day’s worth of work.