Graphics Blacking out video layer below

I have a series of graphics in a timeline that black out the video.

Sometimes I can see it that way in the program window, sometimes I don't see it until I've exported the video. 

It's only certain times in the timeline as these graphics are used twice.  The first instance keeps the video.  The second blacks it out.

The video is a nested sequence.

Using CC2017.0.2 on Mac OSX 10.11.6