Its something specific to the map you're on. Something to do with the lighting I guess. I get the same thing whenever I get that map on a exploration mission.
This is a known bug, and Cryptic has said they are working on it.
It might help the cause if you post this in the proper forum here with some more detailed information on your PC. Specifically your graphics card (& Drivers) as well as your OS.
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It might help the cause if you post this in the proper forum here with some more detailed information on your PC. Specifically your graphics card (& Drivers) as well as your OS.