At that time, I tried editing with DaVinci Resolve, but I had the same problem. This would be quite inaccurate and very time-consuming. For me, it was unacceptable to color grade by eye without any waveforms monitoring and export to see if it was correct. What was my first thought? It was a problem with the editor. On the right is a screenshot from Google Chrome. The problem is quite noticeable when you have to match skin tones.