How does the Workflow Recuring work?

I had made a couple of workflow rules for a client's CRM.

But I dont fully understand how this works, when I set it up like the below pic, I expected it to work like this

- On a date 1 week after the First Instalment date value, this workflow should trigger every month?

But it never worked as expected.

This is what I "want" to accomplish.

I want a workflow to re-occur every monthly on a date, 1 week after the First instalment Date field value, to trigger a function.

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