Pairwise Sticher works, but Grid-Collection Stitcher fails

[iomega15]

Hello,

We tried to stitch two tiff tiles (tile_00002.tif and tile_00003.tif) here:
https://www.dropbox.com/sh/bid6iuykzvmy197/AAA8o5QsIeZ2f0pds4QFcCWla?dl=0
using the grid stitcher using the settings in gridstitch_settings.jpg and position guesses in TileConfiguration.txt

The grid stitcher failed to stitch them (see Log.txt and TileConfiguration.registered_GRID_STITCHER.txt )
However, when I use the pairwise stitcher (see pairwise_settings.jpg and pairwise_settings2.jpg), it is able to stitch them without any initial guesses (see Log.txt and pairwise_result.tif) !