Wage reporting when hours change weekly - 13 months and counting

I work some days through a staffing agency while still certifying. It has been weighing on me all week. The form asks for gross earnings, which I do not see until later. Who can I ask without risking my claim?

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

The claimant handbook has worked examples for part-time pay. Mine was clearer than the phone line.