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allele depth is conflicting with reads depth


I checked the vcf file to get the depth for each allele. for example this allele:

scaffold44 2127674 . T C 106064.77 PASS AC=2;AF=1.00;AN=2;DP=2220;ExcessHet=3.0103;FS=0.000;MLEAC=2;MLEAF=1.00;MQ=60.00;QD=32.42;SOR=6.305 GT:AD:DP:GQ:PL 1/1:0,2220:2220:99:106093,7101,0

it means there are 2220 reads cover it, and all of them are ALT alleles. But I checked the reads depth from IGV, the real depth is 713091. Why are they different?

Thank you very much~

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