When I run into this issue it is typically a color space problem. To fix it, I make sure any of the footage or images I’m using in the project were exported using the SRGB color space algorithm. If it’s too tedious to change all of your footage and assets, the main thing is to get your master project set to SRGB before you do any hires .MOV exporting. Go to: project settings>color and choose SRGBIEC61966-2.1. I find this to be especially important if I’m using Red Giant plugins or other third party plugins for color correction etc. If for whatever reason you’re still having issues with the SRGB color space, you can try one of the other choices. Good luck, I hope that solves it.