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size of gvcf generated by Haplotypecaller of 30x and 100x coverage of the same sample are different

I have a RAW reads with 30x and 100x coverage. When I followed all pre-processed steps as mentioned in GATK best practices to call variant. At last, gvcf files have been generated from both data by Haplotypecaller of GATK 4 but file size different. Why size of gvcf files are different, even same reference sequence was used in alignment by BWA mem? I think size of both gvcf files should be same if variants have been called by using same reference, same aligner i.e. BWA-mem with default parameters for both samples and same per-process steps were followed.
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