In my experience this happes if the hdri has no ground and is not properly cut off at the horizon. PG skies has some freaky colors below the horizon line so you often get those tints. Using a hdri with a ground can help or if you want to use the hdri you are using right now you could try to place a groundplane manually around your room to cut of any colors below the horizon.
first one is with a manually placed groundplane, second image is just the hdri with nothing outside the room.
first one is with a manually placed groundplane, second image is just the hdri with nothing outside the room.
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