we really need to see a sample shot with exif data intact. one possibility i can think of though is positive exposure comphensation is set, which would add light when not needed.
____________________________________________________________________When no one is looking, Pigs can walk on they're hind legs
Copyright © Nikonians 2000, 2014
All Rights Reserved
Nikonians®, NikoScope® and NikoniansAcademy™ are trademarks owned by Nikonians.org.
Nikon®, Nikonos® and Nikkor® are registered trademarks of Nikon Corporation.