I don't know what do you mean with "latest update", since nothing in the latest update (and many updates before) could possibly have any effect on Refueling, which hasn't changed in a long while.
Please make a proper report, indicating:
- the precise, exact, sequence of operations in GSX
- the fuel quantity on board before you called GSX
- the new fuel quantity and how (and exactly when) you changed in the airplane.
- the airplane used. The Fenix A320 and the LVFR A321 have completely different refueling methods, so you need to clarify exactly which procedure you followed in each of them.