Volumetric Fog causing light to get darker after each lighting build

With dense volumetric fog enabled it will cause the lighting to get darker each build you do.

1. Open Attached project
2. Build the lighting a couple times

Results:
Each time you build lighting the level will get darker and darker

Expected:
The lighting should look the same regardless of volumetric fog being enabled

Fix UE-51650

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

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