Fixed labels' number is always 1

[duj4]

Hi Team,
I am running K6 with script below:

This limits the number of variable label app, namespace and pod to 1 (default is 5, 10 and 50 per the code), but should not affect format and os. However, from grafana label browser, all labels are set to 1:

May I know what I missed in the cardinality map?