Question - Maintenance/Audit Recurrence Frequency

let me jump onto this thread as I am still not 100% understanding how this works.

I intend to have a control audited once every semester. So I selected these settings:

The result is 1 audit every year? Totally confusing, what did I do wrong?

image

I jsut thought for a moment I understood and deleted those 2 audits and then changed it to this but the result is the same:

@j.meyer