Inconsistent variant ID

There might be an issue when assigning dbsnp variant ID : 

ex: most samples in run wes_agilent number 0377 have
chr3    124951171       rs66701428      CT      C
one of them has
chr3    124951171       rs66701428;rs772515260  CT      C

Obtained with
 for i in $(ls */\*/\*.reports/\*.final.vcf); do echo $i && grep -m1 124951171 $i | cut -f1,2,3 ; done

STARK version 0.9.18.5
