Problème couleur après export.

You are on a Mac without Reference modes. And this happens when you play the videos in QuickTime Player, and Chrome and Safari browsers.

But it will not happen in VLC or Potplayer, or Firefox browser.

It happens because Apple, for some unknown reason, decided to apply the camera transform specified for Rec.709, as the display transform.

Essentially applying an effective gamma of 1.96, instead of the specified display transform for Rec.709 of gamma 2.4.

Any app that allows ColorSync to "manage" color gets the brighter gamma, 1.96. The apps that don't apply correct display transform using the gamma 2.4 specified for Rec.709 video.

So ... what you do is your choice. You have options in Premiere's color management settings which are all in the Color Workspace, Lumetri panel, the Settings tab ... the tab named Settings.

Set Display  Color Management to on, but past that, it's pick your poison.

If you only care about how it looks on Macs without Reference modes  ... then set the Viewing Gamma to 1.96/QuickTime.  Do your corrections to color.

Then, outside Premiere in Qt Player Chrome and Safari, but only on Macs without Reference modes! ... the image will appear similar to within Premiere on your system.

On all other systems, including Macs with Reference modes set to HDTV, all Android, PCs, TVs, and broadcast compliant setups, your exports will be too dark and oversaturated.

So ... whaddaya want? Systems like yours to get the "right" image, and all others a darker one? Or all others to get a "normal" image, and Macs without Reference modes a lighter shadows image?

If the latter, probably use a viewing gamma setting in Premiere of 2.2, as you choose between 2.2 and 2.4 based the brightness of your viewing environment while doing color work. Only use gamma 2.4 if you are in a darkened room with a monitor set to only 100 nits, which is the professional standard.

See here:

Tone mapping in Premiere Pro

and here:

Color management in Premiere Pro