Hi Robyn,
Welcome to the AGL Community!
It sounds like you're receiving the 44c Feed-in Tariff from the QLD government, and then receiving an additional amount on top of this from AGL. If you make any changes to your system, the QLD government will revoke this 44c rebate. This can be confirmed on Energex's website here:
"...If you increase the capacity of your inverter than that originally approved on your network connection contract, you will no longer be eligible for the 44 cent feed-in tariff under the conditions of the Queensland Solar Bonus Scheme."
Please let me know if you have any further questions!
Kind regards,
Jayden