Did you ever come across how they map parameters inside the VST/AU standard? Everyone else does 0 -> 1. They do 1 -> 120 or something completely boffed.
I'm not surprised given Logic's legacy baggage from the days eMagic was an independent company. Everything was stored in an event list, which would try to fit many things into MIDI-like terminology. Not surprised if they tried to quantize parameters for software instruments the way they would for hardware instruments, and this has stayed the case almost two decades later.