Great question! Your bill is made up of a few different things, not just your usage and solar export. You can review your bill break down on the second page of your invoice, and use our bill explainer if you are unsure here: https://www.agl.com.au/help-support/energy/billing-and-payments/bill-questions-answered/read-your-en...
Of course if you have any specific questions, feel free to message our dedicated team via the AGL app and they can help you with a bill review.
All the best