You haven't given much info to go on, but solar alone is often not enough to eliminate power bills.
Have you had solar long ?
It could be you are new and don't really know how solar benefits you yet, and weren't advised how it be suits some peoples usage and lifestyles.
Eg. if you and others living in the home are at work during the bulk of daylight hours, you will be consuming a minor amount of the energy produced during the day with fridge / freezer, standby items etc, giving most away for a very negligible $ value to the power retailer, for them to resell for a premium to others (in our case around 7.6 x the amount they pay to us here in SA for our feed into the grid).
In our case, where we (you can) REALLY save is we are home most of the time during the day, I'm doing power hungry work, wife is doing household appliance use, we are getting all that usage free, and not at peak or shoulder cost.
The FIT is really just a bonus, and shouldn't be expected to eliminate completely or drastically reduce power bills, unless you have a system that produces perhaps 10x kwh daily vs your normal daily household usage.
We have significant excess power during generating daylight hours, with considerable excess sent to the grid.
You seem to be doing the same, and at night you use from the grid, unless you have a battery set up to use that when dusk / nighttime arrives.
You also have the daily supply charge which for most of us is around $1 a day to add to any usage.
If you have a modern solar system, it should have an app which can give you breakdowns to compare to pre solar usage (from your old bills).
In our case we'd often use 20kw - 25kw a day, now our AGL usage shows ballpark 10kw or so, and with 40 - 70kw feed in daily, we have certainly knocked the bill down a lot so far (just 2 months in from installing the solar).
Yet to see what winter solar drop does to this !
We are carefully weighing up a battery option, and think it will totally wipe the bill.
But you have to justify the cost vs the already greatly reduced bills, and add in other minor benefits like blackout protection.
I don't mind a manageable bill, but not the amounts it was getting to with increases through 2023.
One final thing to consider with a battery, I was advised by 2 of the battery installers recently quoting us, that power companies have apparently asked for yet another increase in 2024, so power prices are only going to continue upwards (and supply charge increases etc), despite the apparent drop in wholesale prices recently as widely reported.
Good luck with finding out your discrepancy in solar production / usage, you might have to talk to AGL or your solar person (sometimes things aren't quite set up right by them).
