Simulator creates reads exceeding transcript start by (-1)

in file mm9_no_tails.bed there are a bunch of reads including genomic coordinate 3103021 (BED-coordinate +1)

chr11 3103020 3103095 chr11:3102356-3144591W:NM_001166549:488:3715:0:199:S/2 0 + . . 0,0,0 75 0

for transcript NM_001166549 starting at 3103022, first exon:

chr11 mm9_refGene exon 3103022 3103329 0.000000 + . gene_id "NM_001166549"; transcript_id "NM_001166549";