Downsampling multiple samples in one folder

[wefer]

Downsampling occurs only on one pair of reads in a folder.
For example downsample.sh CUSTOM DOWNSMPL_TEST 10000

|-- CUSTOM
    |-- Sample_MIC1504A60_CTTCGCAA_1.fastq.gz
    |-- Sample_MIC1504A60_CTTCGCAA_2.fastq.gz
    |-- Sample_MIC1504A68_CATTGACG_1.fastq.gz
    |-- Sample_MIC1504A68_CATTGACG_2.fastq.gz
    |-- Sample_MIC1504A76_TCTGGACA_1.fastq.gz
    `-- Sample_MIC1504A76_TCTGGACA_2.fastq.gz

will only produce downsampled reads for Sample_MIC1504A60_CTTCGCAA
As I understand from the script, this is the inteneded behaviour but is not clear from the documentation.