DaVinci Resolve 17: Flat/nonworking Histogram

Hello,
I have a clip which unfortunatelly is not lit well so I have to correct with histogram.
I did cut, edit the timeline. Then I went to Color-Page. Unfortunatelly the histogram is flat with a very high spike. I don't think its correct, see attachment. The clip contains a sign language interpreter who wears black clothes and sit in front of white wall which is lit with warm light.
There is a three dotted button, where I set histogram to "input" since I want fix the clip in the timeline.
Did I anything wrong, or is that a bug?
I'm using Studio 17 Version (Version 17.1 Build 24).
Best regards
Floh
I have a clip which unfortunatelly is not lit well so I have to correct with histogram.
I did cut, edit the timeline. Then I went to Color-Page. Unfortunatelly the histogram is flat with a very high spike. I don't think its correct, see attachment. The clip contains a sign language interpreter who wears black clothes and sit in front of white wall which is lit with warm light.
There is a three dotted button, where I set histogram to "input" since I want fix the clip in the timeline.
Did I anything wrong, or is that a bug?
I'm using Studio 17 Version (Version 17.1 Build 24).
Best regards
Floh