SCAMP 2.7.0 gives pairs of sources at exactly the same positions and epochs, but significantly different magnitudes

[mrkite92]

Using the command
~/Soft/scamp/bin/scamp -c /Volumes/baskerville/erosdata/astromatic_params/scamp.conf lm*/lm*cat -MATCH_RESOL 0.3 -CROSSID_RADIUS 0.3
then on two catalogue directories corresponding to the two EROS-2 cameras yields pairs of sources at exactly the same positions and epochs.
Working data are at link https://mycore.core-cloud.net/index.php/s/yEedrCdjY67R6tu
scamp.conf file is attached below.
For example in full_1.cat from the above link:
For CATALOG_NUMBER = 595, PHOT_INSTRUM = 2, and SOURCE_NUMBER = 9921, 9922, both have exactly the same coordinates, but the former has MAG = -5.429747 while the latter has MAG = -3.4192264

Working on Mac Darwin Kernel Version 16.7.0

Thanks for any hint,
Cheers,
JB

scamp.conf.zip