Video outside of composition is darker than in composition / after effects problem

Hello together

I have a problem with the color. I imported 3 rec709 gamma 2.4 videos and made for each a composition. On the screenshots you can see, that in the composition the video is clear like "normal" colors. But when i am outside the composition, in the main composition, the video is darker. It also renders darker and I can not work with that.

The color workspace from affter effects is already "NONE". I tried also REC709 Gamma2.4 and other workspaces but didn't change anything.

Does anyone has a solution for this?

I already asked on reddit but nobody could help:/

best regards