Wage reporting when hours change weekly, electrician's helper here

I work some days through a staffing agency while still certifying. There are 4 people counting on me, so I am trying to be careful. Pay posts on a different day from when I work. Did anyone get an overpayment notice from a mistake?

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.