I downloaded the sample files and could not figure anything. Of course, first thing was to browse all the metadata to see if the camera had a wrong setting, but nothing there.
I was thinking that a 18% grey card would come handy here to find the precise exposure offset and adjust the camera, as suggested by Tim already.
On a completely unrelated note, I just saw a picture of a banner about disease prevention testing that read "This year thousands of men will die due to stubbornness".
Underneat, someone wrote "NO WE
WON'T".
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Alberto Tirado
Alberto Tirado
My "fix" for the situation has been very simple - I just increased the exposure compensation by +0.5 EV.