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Inconsistent DP within a site in vcf

Hi,
I'm running on the Unified Genotyper (Version=3.3-0-g37228af) on a pooled sample. The ploidy is set to 32. I'm trying to get allele frequency information. I'm trying to filter sites based on depth of coverage but the DP flag is not consistent within a loci

groupIV 756 . C T 141.24 . AC=11;AF=0.344;AN=32;BaseQRankSum=-2.927;DP=37;Dels=0.65;FS=0.000;HaplotypeScore=166.3715;MLEAC=11;MLEAF=0.344;MQ=86.28;MQ0=0;MQRankSum=-0.696;QD=3.82;ReadPosRankSum=-2.927;SOR=1.022 GT:AD:DP:GQ:PL 0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/0/1/1/1/1/1/1/1/1/1/1/1:8,5:13:0:155,39,25,17,12,9,6,4,2,1,1,0,0,0,0,1,2,2,4,5,7,9,11,14,17,21,25,31,38,47,60,2147483647,2147483647

The DP at the start says there is a depth of 37, but at the end it says its 13. Judging from neighbouring sites, the actual depth seems to be 37, but I'm confused why it seems to only be using 13 of them. At other sites the scores match.

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