When I ran SExtractor on cutouts from Y1A1 and compared to the catalog given by DES, there are offsets in magnitude (using Mag_Automag_auto_comp.ps) ranging from 6-8 magnitudes (see attached ps file). There has to be some correction or additional offset to apply to these images. Additionally, I normalized the exposure time to 1s for my cutouts.
Are you using MAG_ZEROPOINT=30 when re-running SExtractor?
Can you tell us if you are using coadd images or single-epoch images?
These are coadds
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