What I am doing wrong?
CR2 before processing:

Crop

After processing in cr2hdr

Log:
cr2hdr: a post processing tool for Dual ISO images
Last update: ab1e90c on 2015-11-24 09:50:19 UTC by a1ex:
cr2hdr: moved safeguard from median_int_wirth to kth_smallest_i...
Active options:
--amaze-edge : use a temporary demosaic step (AMaZE) followed by edge-directed interpolation (default)
--cs2x2 : apply 2x2 chroma smoothing in noisy and aliased areas (default)
--wb=graymax : set AsShotNeutral by maximizing the number of gray pixels (default)
Input file : DUAL0022.CR2
Camera : Canon EOS 5D Mark III
Full size : 5920 x 3950
Active area : 5796 x 3870
Black borders : 124 left, 80 top
Black level : 2046
ISO pattern : dBBd RGGB
White levels : 15154 13824
Noise levels : 7.87 35.56 34.86 7.83 (14-bit)
ISO difference : 5.92 EV (6038)
Black delta : 1.76
Black adjust : -6
Dynamic range : 10.71 (+) 8.37 => 14.29 EV (in theory)
Looking for hot/cold pixels...
Hot pixels : 81
Cold pixels : 10476
AMaZE interpolation ...
Amaze took 5.14 s
Edge-directed interpolation...
Semi-overexposed: 3.07%
Deep shadows : 96.18%
Horizontal stripe fix...
Full-res reconstruction...
ISO overlap : 3.0 EV (approx)
Half-res blending...
Chroma smoothing...
Building alias map...
Filtering alias map...
Smoothing alias map...
Final blending...
Noise level : 30.61 (20-bit), ideally 30.60
Dynamic range : 14.74 EV (cooked)
Black adjust : 2
AsShotNeutral : 0.57 1 0.55, 4308K/g=1.09 (gray max)
Output file : DUAL0022.DNG (already exists, overwriting)
DUAL0022.DNG : copying EXIF from DUAL0022.CR2