why my process only open once

[huang long]

dear all:

my code is

grouplist2.splitCsv(header:false,sep:'\t').groupTuple().set{groups}

process tajimaD1{

    publishDir "${params.outdir}/03.tajimaD", pattern:"*"

    queue "DNA"

    cpus 8

    executor "slurm"

    memory "30G"

    cache 'lenient'

    input:

        file vcf from filter_vcf2

        tuple gid,gfile from groups

    output:

        file "*.Tajima.D"

    script:

    """

       vcftools --gzvcf ${vcf} --remove-indels --TajimaD ${params.win} --keep ${gfile[0]} --out ${gid[1]}

    """

}

but I have already generate a 9 line grouplist2 file but when I run it only generate the first line

why