Issue with .map file generated using Plink software

Question

[taniamahmood38]

Dear all,

I am working with the vcf file (generated using bcftools) to create a map file using plink software. The command i am using is

./plink --vcf sample.vcf --out sample --recode --allow-extra-chr 

The output .map file looks like this

CM004562.1  .   0   1645
CM004562.1  .   0   4771
CM004562.1  .   0   4811
CM004562.1  .   0   4812
CM004562.1  .   0   5001
CM004562.1  .   0   5672
CM004562.1  .   0   5674
CM004562.1  .   0   5678
CM004562.1  .   0   5684
CM004562.1  .   0   5802

Kindly guide me where i am wrong? Why it outputs zero in the 3rd column?, and how to fix that?

Any help/suggestions would be highly appreciated.

Thanks in advance