Color page viewer applies grade from upper track to lower tr

I am trying to grade two clips on the color page that are stacked one above the other on the edit page. I initially set up the grades for each clip with just that clip's video track enabled on the edit page. With both tracks enabled, I can see the different grading nodes when I select each clip on the color page. But, the viewer shows the lower clip with the grade from the upper clip. When I try to change the grading on the lower clip nothing changes in the viewer. Is it normal for the grade of an upper-level clip to be applied to a clip on a lower level when looking at the clips on the color page?

Thanks,
Steve

[Peter Chamberlain]

U need to use the unmix button, bottom left of color viewer

Thank you very much! I totally missed seeing that button. Turning on Unmix was the answer.

Steve