vcf file analysis

Hello everyone, I have 22 vcf file for each chr.
They were in genome build hg19 so I did a liftover and convert them to hg38 genome build.
Now I need just chrom and position values from these vcf files and merge them together into a separate coloumn to form chrom_pos. But in my case I am getting some added values.
So i use linux awk command to extract chr and pos values.
But when I see the output its coming very weird like it has some values corresponding to chr2 also.
Like this:

 chr2_KI270773v1_alt 
chr2_KI270894v1_alt