How do you report hours that vary week to week? - first time posting

I picked up part-time shifts as a social media manager and I am confused about how to report them. There are 16 people counting on me, so I am trying to be careful. Sometimes my paycheck is late by a week. Did anyone get an overpayment notice from a mistake?

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.