Read counts equals to 0 in indel mutations called by VarScan

Dear Galaxy,

As I used the VarScan to call variants, I realized that many of the output lines that were called as indel mutation had the read counts information (i.e. AD, DP, FREQ, ADF, ADR, etc.) equals to 0.

I reviewed those positions with bam file on igv, and I did see that there were reads mapped to those positions. Is there an explanation for this?

Thanks a lot,