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Hi, I'm calling Variants with HaplotypeCaller in a population of 2 Parents and 7 F1-individuals. After read backed phasing I'm combining the vcf files of my genotypes with CombineVariants. In the outfile I very often find "./.". I thought this means there is no coverage at a certain position. But at many positions I do have good coverage. Why do I then get ./.? Moreover I used FastaAlternateReferenceMaker and created a new reference sequence including the variants from the parents. In that case, after I run HC and do the phasing and combine variants steps, I only get "./." at positions where there is really no coverage (as I can see in my mappings).