I have a list of VCFs that I'm converting from gVCF to VCF thus:

zcat HG00096.final_combined.g.vcf.gz | gvcftools-0.17.0/bin/break_blocks --region-file gsa_positions.chromEnd_plus1.bed --ref g1k_v37/human_g1k_v37.fasta --exclude-off-target > vcf/HG00096.bb.vcf 2> break_blocks_err/HG00096.bb.err

the bed file looks like

1   58813   58814   GSA-rs114420996 .   G   A   PASS    .   GT:GQ   ./.:0.0
1   565507  565508  GSA-rs9283150   .   G   A   PASS    .   GT:GQ   ./.:0.0
1   567091  567092  GSA-rs9326622   .   T   C   PASS    .   GT:GQ   ./.:0.0
1   726911  726912  GSA-1:726912    .   A   G   PASS    .   GT:GQ   0/0:0.27129138
1   727840  727841  GSA-rs116587930 .   G   A   PASS    .   GT:GQ   0/0:0.6141555

but the problem is that the output files are missing alternate alleles, e.g.

#CHROM  POS ID  REF ALT QUAL    FILTER  INFO    FORMAT  HG00126
1   58814   .   G   <NON_REF>   .   .   .   GT:DP:GQ:MIN_DP:PL  0/0:31:84
:29:0,84,1192
1   565508  .   G   <NON_REF>   .   .   .   GT:DP:GQ:MIN_DP:PL  0/0:27:50
:27:0,50,857
1   567092  .   T   <NON_REF>   .   .   .   GT:DP:GQ:MIN_DP:PL  0/0:16:45
:16:0,45,675

I've also tried piping to extract_variants from Converting Gvcf Files Into Vcf but this isn't working either.

how can I get the output to not have the NON_REF so that it looks like a correct VCF?