Colors look like I've added a grey film on top

[Michèle35363481j2bo]

The colors on my whole project look like I've added a grey adjustment layer on top. But there is no such thing. Can anyone help me find out where the problem could be? I've attached a picture of the original clip and on the right the greyed clip.
Thanks for the help!

[Ann Bens]

It is all about color management.

Might want to read below:

Color management in Premiere Pro

Tone mapping in Premiere Pro