Depth is larger than AltDepth, strange variant

[worker000000]

Dear professor,
Thanks for building such a poweful software, I found a strange variant using vardcit, the Depth is larger than AltDepth, and the deletion length is 471bp, really very large

this is my command

VarDict -G hg19_chr.fa -f 0.001 -N test -b test.bam -c 1 -S 2 -E 3 -r 2 -Q 30 -U -h test.bed >test.vardict.txt

perl vardict2vcf.pl test.vardict.txt test.vardict.vcf

chr7 140500846 . TACAAAATAGCTAACAGAATCAGACTACCTGATCTGTGGTACAAAATCATAATGCTTAATTTAATTGAAACAACTCTCCCTCTCCTCCTAGAAACTATCCAAAAATGGTTTCTATGGGTTAGGGGTCTTGATTAATTAAACGATAATATAAAATATAAATTAACTGTATAGCTGAACCAGCATTACAATTTGGGAGAGAAATACTGTCCATTCCACATATTATTCTCTAACTACACTTAAAAAAAATTCTCTATAACAATCGTATGGAAGAAAAACCCTCACAGACTTTTAGACATCGTAGCTTCACATTAAGAAAATTTAAGTGTAAAATGGTAGGTAGAAAAGAGATATTTTTGGATTACTTACTCAAGTTGGTCATAATTAACACACATCAGTGGAACTTCTGTACTACAACGCTGGTGAAATTTATAACCACATGTTTGACAGCGGAAACCCTGGAAAAGCAGCTTTCG T . . . GT A/-472 1 4 1.0000