CR2 thumbnail image is darker

DxO PureRAW
15

I post 3 RAW
1 is Normal , 2 are Darker
DxO Normal-Pitta.CR2 (20.7 MB)
DxO Darker 1-Purple Swamphen.cr2 (23.8 MB)
DxO Darker 2 - Chestnut Munia.CR2 (19.4 MB)

Wei-Hsin Chen