Hi Dast,
Welcome to the AGL Community!
There are digital meters (mostly in NSW) that record usage in 15-30 minutes intervals similar to smart meters. However, the difference between these meters and smart meters is that they do not transmit this data remotely on a daily basis. This is the most likely cause of your data displaying differently to your sisters!
If you'd like to arrange for your meter to be upgraded free of charge, I encourage you to get in touch with our digital metering team on 1300 669 245.
Kind regards,
Jayden