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3D Widget Color Transparancy Issue

I have a 3D widget containing a green progress bar placed into my scene. As I look around my level, the color of the progress bar continually changes transparency. If at any point I look directly at the progress bar, from then on the color is exactly correct no matter where I look. Here is a video: https://drive.google.com/open?id=1_-tnLn-KDzOH8zkEBPG5PQFzhbYAeVYD Any idea what could be going on?