If you are using the developer version of the A32NX, the MSFS fuel and payload UI have been disabled. If you don’t load the airplane using the MCDU for passengers and the EFB (iPad) for fuel, you will start with about the same weight each time.
Please see https://docs.flybywiresim.com/fbw-a32nx/feature-guides/loading-fuel-weight/ for the correct loading procedure.