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Some good advice there . . .
"Review Your FIT Agreement: Carefully re-read your Feed-in Tariff agreement with AGL. Double-check the exact rates and any terms and conditions related to payment calculations.
Contact AGL Directly: The most important step is to contact AGL's customer service or their solar/FIT department. Explain the discrepancy clearly, providing them with the daily export data from your app and your expected payment calculation."
Also check your plan, it's listed on your Overview > View plan details link on your app or web login.
That should say Solar Savers.
Contacting AGL now by phone is advised, the sooner any bug can be worked out, the sooner they can adjust any figures charged / paid incorrectly before bill time.