It's probably the white balance, I have it with my 6d when I have "normal" dng's.
The "tint"(magenta/green balance) is always set fully to the magenta side by default, which results in these magenta colored frames.
Easy to fix, open the files in you're favorite raw editor (DaVinci Resolve, lightroom etc.) and put the slider for magenta/green balance in the right place.
If you want files that look normal by default, you can use a MLV/raw to CDNG(CinemaDNG) workflow, search for "raw2cdng".
The cinemadng's I get have always normal white balance set by default.