HaplotypeCaller variant with 0/0 genotype

Hi,
There are some confused result found in the output gvcf of HaplotypeCaller. Why the genotypes is 0/0 but called a GC->G deletion? see below for example.

chr8 118915071 . GC G,<NON_REF> 0 . DP=37;MLEAC=0,0;MLEAF=0.00,0.00;MQ=60.29;MQ0=0 GT:AD:DP:GQ:PL:SB 0/0:35,0,0:35:99:0,104,1078,105,1079,1080:27,8,0,0
chr8 118915072 rs34953549 CA C,<NON_REF> 0 . BaseQRankSum=1.783;ClippingRankSum=-0.149;DB;DP=40;MLEAC=0,0;MLEAF=0.00,0.00;MQ=60.27;MQ0=0;MQRankSum=0.743;ReadPosRankSum=1.296 GT:AD:DP:GQ:PL:SB 0/0:25,3,0:28:24:0,24,331,71,340,387:18,7,0,0

Thanks a lot!
Hiu